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https://www.readbyqxmd.com/read/29144015/elucidating-the-impact-of-chalcogen-content-on-the-photovoltaic-properties-of-oxychalcogenide-perovkskites-namo3-xqx-m-nb-ta-and-q-s-se-te
#1
Heesoo Park, Fahhad H Alharbi, Stefano Sanvito, Nouar Tabet, Fedwa El-Mellouhi
In the quest for non-toxic and stable perovskites for solar cells, we conduct a systematic study of the effect of chalcogen content in oxychalcogenide perovskite using density functional theory (DFT) and quasi-particle perturbation theory. We explore the changes in the electronic structure due to the substitution of O atoms in NaNbO 3 and NaTaO 3 perovskite structures with various chalcogen (S, Se, Te) at different concentrations. Interestingly, the introduction of the chalcogen atoms results in a drastic reduction of the electronic band gap, making some of them fall within the visible range of the solar spectrum...
November 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29140071/ion-implantation-modified-fluorine-doped-tin-oxide-by-zirconium-with-continuously-tunable-work-function-and-its-application-in-perovskite-solar-cells
#2
Dong Han, Cuncun Wu, Yunbiao Zhao, Yi Chen, Lixin Xiao, Ziqiang Zhao
In recent years, perovskite solar cells have drawn widespread attention. As an electrode material, fluorine-doped tin oxide (FTO) is widely used in various kinds of solar cells. However, the relatively low work function (WF) (~4.6 eV) limits its application. The potential barrier between the transparent conductive oxide (TCO) electrode and the hole transport layer (HTL) in inverted perovskite solar cells results in device performance decrease. In this paper, we propose a method to adjust WF of FTO by implanting zirconium ions into the FTO surface...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139395/three-dimensional-architecture-hybrid-perovskite-solar-cells-using-cds-nanorod-arrays-as-an-electron-transport-layer
#3
Zihang Song, Guoqing Tong, Huan Li, Guopeng Li, Shuai Ma, Shimeng Yu, Qian Liu, Yang Jiang
Three-dimensional (3-D) architecture perovskite solar cells (PSCs) using CdS nanorod arrays as electron transport layer were designed and prepared by layer-by-layer via a physical-chemical vapor deposition process (P-CVD). The CdS NRs not only provided a scaffold to perovskite film, but also increased the interfacial contact between the perovskite film and electron transport layer. As an optimized result, a high power conversion efficiency (PCE) of 12.46% with a short-circuit current density (Jsc) of 19.88 mA cm-2, an open-circuit voltage (Voc) of 1...
November 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29139155/additive-enhanced-crystallization-of-solution-process-for-planar-perovskite-solar-cells-with-efficiency-exceeding-19
#4
Shuai You, Shiqing Bi, Jing Huang, Qiushuang Jia, Yuhe Yuan, Yanjie Xia, Zhenyu Xiao, Zhuzhu Sun, Jiangfeng Liu, Shujie Sun, Zhiqiang Zhao
To reduce intrinsic defect density in perovskite films, various additives are often added into the precursor solution. In this paper, a novel solution approach where isopropanol (IPA) was added into the precursor solution was developed for the preparation of normal planar perovskite solar cells (PSCs). A champion power conversion efficiency (PCE) of 19.70% was achieved with this approach. By adding IPA into the precursor solution, CH3NH3PbI3 perovskite showed better crystallization and stability, indicating improved film quality...
November 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29135219/room-temperature-and-solution-processable-cu-doped-nickel-oxide-nanoparticles-for-efficient-hole-transport-layers-of-flexible-large-area-perovskite-solar-cells
#5
Qiqi He, Kai Yao, Xiaofeng Wang, Xuefeng Xia, Shifeng Leng, Fan Li
Flexible perovskite solar cells (PeSCs) using plastic substrates have become one of the most attractive points in the field of thin film solar cells. Low-temperature and solution-processable nanoparticles enable the fabrication of semiconductor thin films in a simple and low cost approach to function as charge-selective layers in flexible PeSCs. Here, we synthesized phase-pure p-type Cu-doped NiOx nanoparticles (NPs) with good electrical properties, which can be processed to smooth, pinhole-free and efficient hole transport layers (HTLs) with large-area uniformity over a wide range of film thickness using the room-temperature solution-processing technique...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29134800/high-performance-solid-state-pbs-quantum-dot-sensitized-solar-cells-prepared-by-introduction-of-hybrid-perovskite-inter-layer
#6
Jin Hyuck Heo, Min Hyuk Jang, Min Ho Lee, Dong Hee Shin, Do Hun Kim, Sang Hwa Moon, Sang-Wook Kim, Bum Jun Park, Sang Hyuk Im
High performance solid-state PbS quantum dot-sensitized solar cells (QD-SSCs) with stable 9.2 % power conversion efficiency at 1 Sun condition are demonstrated by introduction of hybrid perovskite inter-layer. The PbS QDs formed on mesoscopic TiO¬¬2 (mp-TiO2) by spin-assisted successive precipitation and anionic exchange reaction method do not exhibit PbSO4 but have PbSO3 oxidation species. By introducing perovskite inter-layer in between mp-TiO2/PbS QDs and poly-3-hexylthiophene, the PbSO3 oxidation species are fully removed in the PbS QDs and thereby the efficiency of PbS QD-SSCs is enhanced over 90 % compared to the pristine PbS QD-SSCs...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29134795/robust-and-recyclable-substrate-template-with-ultrathin-nanoporous-counter-electrode-for-organic-hole-conductor-free-monolithic-perovskite-solar-cells
#7
Ming-Hsien Li, Yu-Syuan Yang, Kuo-Chin Wang, Yu-Hsien Chiang, Po-Shen Shen, Wei-Chih Lai, Tzung-Fang Guo, Peter Chen
A robust and recyclable monolithic substrate applying all-inorganic metal-oxide selective contact with nanoporous (np) Au:NiOx counter electrode is successfully demonstrated for efficient perovskite solar cells, of which the perovskite active layer is deposited in the final step for device fabrication. Through annealing of the Ni/Au bilayer, the nanoporous NiO/Au electrode is formed in virtue of interconnected Au network embedded in oxidized Ni. By optimizing the annealing parameters and tuning the mesoscopic layer thickness (mp-TiO2 and mp-Al2O3), a decent PCE of 10...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29134752/ideal-bandgap-organic-inorganic-hybrid-perovskite-solar-cells
#8
Zhibin Yang, Adharsh Rajagopal, Alex K-Y Jen
Extremely high power conversion efficiencies (PCEs) of ≈20-22% are realized through intensive research and development of 1.5-1.6 eV bandgap perovskite absorbers. However, development of ideal bandgap (1.3-1.4 eV) absorbers is pivotal to further improve PCE of single junction perovskite solar cells (PVSCs) because of a better balance between absorption loss of sub-bandgap photons and thermalization loss of above-bandgap photons as demonstrated by the Shockley-Queisser detailed balanced calculation. Ideal bandgap PVSCs are currently hindered by the poor optoelectronic quality of perovskite absorbers and their PCEs have stagnated at <15%...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29134092/enhanced-photovoltaic-properties-of-perovskite-solar-cells-by-tio2-homogeneous-hybrid-structure
#9
Pengyu Su, Wuyou Fu, Huizhen Yao, Li Liu, Dong Ding, Fei Feng, Shuang Feng, Yebin Xue, Xizhe Liu, Haibin Yang
In this paper, we fabricated a TiO2 homogeneous hybrid structure for application in perovskite solar cells (PSCs) under ambient conditions. Under the standard air mass 1.5 global (AM 1.5G) illumination, PSCs based on homogeneous hybrid structure present a maximum power conversion efficiency of 5.39% which is higher than that of pure TiO2 nanosheets. The enhanced properties can be explained by the better contact of TiO2 nanosheets/nanoparticles with CH3NH3PbI3 and fewer pinholes in electron transport materials...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133834/instability-in-ch3nh3pbi3-perovskite-solar-cells-due-to-elemental-migration-and-chemical-composition-changes
#10
Zubair Ahmad, Mansoor Ani Najeeb, R A Shakoor, Abdulla Alashraf, Shaheen A Al-Muhtaseb, Ahmed Soliman, M K Nazeeruddin
Organic-inorganic halide perovskites have rapidly grown as favorable materials for photovoltaic applications, but accomplishing long-term stability is still a major research problem. This work demonstrates a new insight on instability and degradation factors in CH3NH3PbI3 perovskite solar cells aging with time in open air. X-ray photoelectron spectroscopy (XPS) has been used to investigate the compositional changes caused by device degradation over the period of 1000 hrs. XPS spectra confirm the migration of metallic ions from the bottom electrode (ITO) as a key factor causing the chemical composition change in the perovskite layer besides the diffusion of oxygen...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131542/the-three-dimensional-structure-of-twisted-benzo-ghi-perylene-triimide-dimer-as-a-non-fullerene-acceptor-for-inverted-perovskite-solar-cells
#11
Priyadharsini Karuppuswamy, Hung-Cheng Chen, Pen-Cheng Wang, Chao-Ping Hsu, Ken-Tsung Wong, Chih Wei Chu
In this work, we introduced benzo[ghi]perylenetriimide (BPTI) derivatives including monomer and twisted dimer (t-BPTI) as an alternative electron transport layer (ETL) material to replace the commonly used PC61BM in inverted planar heterojunction perovskite solar cells. Moreover, the double ETL layer was applied in our perovskite solar cells with structure of glass/ITO/PEDOT:PSS/perovskite/BPTI/C60 or PDI-C4/BCP/Al. Use of a double ETL layer structure can effectively eliminate the leakage current. The devices with the t-BPTI/C60 double ETL layer yield an average power conversion efficiency of 10...
November 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29131429/highly-efficient-porphyrin-based-opv-perovskite-hybrid-solar-cells-with-extended-photoresponse-and-high-fill-factor
#12
Ke Gao, Zonglong Zhu, Bo Xu, Sae Byeok Jo, Yuanyuan Kan, Xiaobin Peng, Alex K-Y Jen
Employing a layer of bulk-heterojunction (BHJ) organic semiconductors on top of perovskite to further extend its photoresponse is considered as a simple and promising way to enhance the efficiency of perovskite-based solar cells, instead of using tandem devices or near infrared (NIR)-absorbing Sn-containing perovskites. However, the progress made from this approach is quite limited because very few such hybrid solar cells can simultaneously show high short-circuit current (JSC ) and fill factor (FF). To find an appropriate NIR-absorbing BHJ is essential for highly efficient, organic, photovoltaics (OPV)/perovskite hybrid solar cells...
November 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29129082/first-principles-study-of-electron-injection-and-defects-at-the-tio2-ch3nh3pbi3-interface-of-perovskite-solar-cells
#13
Jun Haruyama, Keitaro Sodeyama, Ikutaro Hamada, Liyuan Han, Yoshitaka Tateyama
We investigated electron injection rates and vacancy defect properties by performing first-principles calculations on the interface of an anatase-TiO2(001) and a tetragonal CH3NH3PbI3(110) (MAPbI3(110)). We found that the coupling matrix element between the lowest unoccupied molecular orbital of MAPbI3 and the TiO2 conduction band (CB) minimum is negligibly small, the indication being that electron-injection times for low-energy excited states are quite long (more than several tens of picoseconds). We also found that higher-lying CB states coupled more strongly; injection was expected to take place on a femtosecond time scale...
November 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29129051/modulation-of-charge-recombination-in-cspbbr3-perovskite-films-with-electrochemical-bias
#14
Rebecca A Scheidt, Gergely F Samu, Csaba Janáky, Prashant V Kamat
The charging of mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of electrochemical bias on the charge carrier recombination process. The transient absorption spectroscopy experiments conducted at different applied potentials indicate a decrease in the charge carrier lifetimes of CsPbBr3 as we increase the potential from -0.6 V to + 0...
November 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29124921/effect-of-rubidium-incorporation-on-the-structural-electrical-and-photovoltaic-properties-of-methylammonium-lead-iodide-based-perovskite-solar-cells
#15
Ik Jae Park, Seongrok Seo, Min Ah Park, Sangwook Lee, Dong Hoe Kim, Kai Zhu, Hyunjung Shin, Jin Young Kim
We report the electrical properties of rubidium-incorporated methylammonium lead iodide ((RbxMA1-x)PbI3) films and the photovoltaic performance of (RbxMA1-x)PbI3 film-based p-i-n-type perovskite solar cells (PSCs). The incorporation of a small amount of Rb(+) (x=0.05) increases both the open circuit voltage (Voc) and the short circuit photocurrent density (Jsc) of the PSCs, leading to an improved power conversion efficiency (PCE). However, a high fraction of Rb(+) incorporation (x=0.1 and 0.2) decreases the Jsc and thus the PCE, which is attributed to the phase segregation of the single tetragonal perovskite phase to a MA-rich tetragonal perovskite phase and a RbPbI3 orthorhombic phase at high Rb fractions...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29123061/properties-and-potential-optoelectronic-applications-of-lead-halide-perovskite-nanocrystals
#16
REVIEW
Maksym V Kovalenko, Loredana Protesescu, Maryna I Bodnarchuk
Semiconducting lead halide perovskites (LHPs) have not only become prominent thin-film absorber materials in photovoltaics but have also proven to be disruptive in the field of colloidal semiconductor nanocrystals (NCs). The most important feature of LHP NCs is their so-called defect-tolerance-the apparently benign nature of structural defects, highly abundant in these compounds, with respect to optical and electronic properties. Here, we review the important differences that exist in the chemistry and physics of LHP NCs as compared with more conventional, tetrahedrally bonded, elemental, and binary semiconductor NCs (such as silicon, germanium, cadmium selenide, gallium arsenide, and indium phosphide)...
November 10, 2017: Science
https://www.readbyqxmd.com/read/29123060/promises-and-challenges-of-perovskite-solar-cells
#17
REVIEW
Juan-Pablo Correa-Baena, Michael Saliba, Tonio Buonassisi, Michael Grätzel, Antonio Abate, Wolfgang Tress, Anders Hagfeldt
The efficiencies of perovskite solar cells have gone from single digits to a certified 22.1% in a few years' time. At this stage of their development, the key issues concern how to achieve further improvements in efficiency and long-term stability. We review recent developments in the quest to improve the current state of the art. Because photocurrents are near the theoretical maximum, our focus is on efforts to increase open-circuit voltage by means of improving charge-selective contacts and charge carrier lifetimes in perovskites via processes such as ion tailoring...
November 10, 2017: Science
https://www.readbyqxmd.com/read/29123021/a-generic-interface-to-reduce-the-efficiency-stability-cost-gap-of-perovskite-solar-cells
#18
Yi Hou, Xiaoyan Du, Simon Scheiner, David P McMeekin, Zhiping Wang, Ning Li, Manuela S Killian, Haiwei Chen, Moses Richter, Ievgen Levchuk, Nadine Schrenker, Erdmann Spiecker, Tobias Stubhan, Norman A Luechinger, Andreas Hirsch, Patrik Schmuki, Hans-Peter Steinrück, Rainer H Fink, Marcus Halik, Henry J Snaith, Christoph J Brabec
A major bottleneck delaying the further commercialization of thin-film solar cells based on hybrid organohalide lead perovskites is the interface losses in state-of-the-art devices. We present a generic interface architecture that combines solution-processed, reliable, and cost-efficient hole-transporting materials, without compromising efficiency, stability or scalability of perovskite solar cells. Tantalum doped tungsten oxide (Ta-WO x )/conjugated polymer multilayers offer a surprisingly small interface barrier and form quasi-ohmic contacts universally with various scalable conjugated polymers...
November 9, 2017: Science
https://www.readbyqxmd.com/read/29120165/efficient-planar-structured-perovskite-solar-cells-with-enhanced-open-circuit-voltage-and-suppressed-charge-recombination-based-on-slow-grown-perovskite-layer-from-lead-acetate-precursor
#19
Cong Li, Qiang Guo, Zhibin Wang, Yiming Bai, Lin Liu, Fuzhi Wang, Erjun Zhou, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
For planar structured organic-inorganic hybrid perovskite solar cells (PerSCs) with PEDOT:PSS hole transportation layer, the open-circuit voltage (Voc) of the device is limited to be about 1.0 V, resulting inferior performance in comparison with TiO2 based planar counterparts. Therefore, increasing Voc of the PEDOT:PSS based planar device is an important way to enhance the efficiency of the PerSCs. Herein, we demonstrate a novel approach of formation perovskite film by slow-growing from lead acetate precursor via one-step spin-coating process without thermal annealing process...
November 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29119988/di-isopropyl-ether-assisted-crystallization-of-organic-inorganic-perovskites-for-efficient-and-reproducible-perovskite-solar-cells
#20
Lu-Yao Wang, Lin-Long Deng, Xin Wang, Tan Wang, Hao-Ran Liu, Si-Min Dai, Zhou Xing, Su-Yuan Xie, Rong-Bin Huang, Lan-Sun Zheng
Organic-inorganic perovskite solar cells have emerged as a promising photovoltaic technology because of their advantages such as low cost, high efficiency, and solution processability. The performance of perovskite solar cells is highly dependent on the crystallinity and morphology of the perovskite films. Herein, we report a simple, one-step anti-solvent deposition process using di-isopropyl ether as a dripping solvent to obtain extremely uniform and highly crystalline CH3NH3PbI3 perovskite films. Compared to toluene, chlorobenzene, chloroform, or diethyl ether, di-isopropyl ether has proven to be a more suitable solvent for an anti-solvent deposition process...
November 9, 2017: Nanoscale
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