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https://www.readbyqxmd.com/read/29350044/enhanced-thermal-stability-in-perovskite-solar-cells-by-assembling-2d-3d-stacking-structures
#1
Yun Lin, Yang Bai, Yanjun Fang, Zhaolai Chen, Shuang Yang, Xiaopeng Zheng, Shi Tang, Ye Liu, Jingjing Zhao, Jinsong Huang
Two-dimensional (2D) perovskites have been shown to be more stable than their three-dimensional (3D) counterparts due to the protection of the organic ligands. Herein a method is introduced to form 2D/3D stacking structures by the reaction of 3D perovskite with n-Butylamine (BA). Different from regular treatment with n-Butylammonium iodide (BAI) where 2D perovskite with various layers form, the reaction of BA with MAPbI3 only produce (BA)2PbI4, which has better protection due to more organic ligands in (BA)2PbI4 than the mixture of 2D perovskites...
January 19, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29349865/superfast-room-temperature-activation-of-sno2-thin-films-via-atmospheric-plasma-oxidation-and-their-application-in-planar-perovskite-photovoltaics
#2
Haejun Yu, Hye-In Yeom, Jong Woo Lee, Kisu Lee, Doyk Hwang, Juyoung Yun, Jaehoon Ryu, Jungsup Lee, Sohyeon Bae, Seong Keun Kim, Jyongsik Jang
The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has now exceeded 20%; thus, research focus has shifted to establishing the foundations for commercialization. One of the pivotal themes is to curtail the overall fabrication time, to reduce unit cost, and mass-produce PSCs. Additionally, energy dissipation during the thermal annealing (TA) stage must be minimized by realizing a genuine low-temperature (LT) process. Here, tin oxide (SnO2 ) thin films (TFs) are formulated at extremely high speed, within 5 min, under an almost room-temperature environment (<50 °C), using atmospheric Ar/O2 plasma energy (P-SnO2 ) and are applied as an electron transport layer of a "n-i-p"-type planar PSC...
January 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29349858/efficient-hysteresis-free-and-stable-perovskite-solar-cells-with-zno-as-electron-transport-layer-effect-of-surface-passivation
#3
Jing Cao, Binghui Wu, Ruihao Chen, Youyunqi Wu, Yong Hui, Bing-Wei Mao, Nanfeng Zheng
The power conversion efficiency of perovskite solar cells (PSCs) has ascended from 3.8% to 22.1% in recent years. ZnO has been well-documented as an excellent electron-transport material. However, the poor chemical compatibility between ZnO and organo-metal halide perovskite makes it highly challenging to obtain highly efficient and stable PSCs using ZnO as the electron-transport layer. It is demonstrated in this work that the surface passivation of ZnO by a thin layer of MgO and protonated ethanolamine (EA) readily makes ZnO as a very promising electron-transporting material for creating hysteresis-free, efficient, and stable PSCs...
January 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29348661/highly-efficient-and-stable-inverted-perovskite-solar-cell-employing-pedot-go-composite-layer-as-a-hole-transport-layer
#4
Jae Choul Yu, Ji A Hong, Eui Dae Jung, Da Bin Kim, Soo-Min Baek, Sukbin Lee, Shinuk Cho, Sung Soo Park, Kyoung Jin Choi, Myoung Hoon Song
The beneficial use of a hole transport layer (HTL) as a substitution for poly(3,4-ethlyenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) is regarded as one of the most important approaches for improving the stability and efficiency of inverted perovskite solar cells. Here, we demonstrate highly efficient and stable inverted perovskite solar cells by applying a GO-doped PEDOT:PSS (PEDOT:GO) film as an HTL. The high performance of this solar cell stems from the excellent optical and electrical properties of the PEDOT:GO film, including a higher electrical conductivity, a higher work function related to the reduced contact barrier between the perovskite layer and the PEDOT:GO layer, enhanced crystallinity of the perovskite crystal, and suppressed leakage current...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29345471/synthesis-and-properties-of-dithiafulvenyl-functionalized-spiro-fluorene-9-9-xanthene-molecules
#5
Min Wu, Juan Li, Ruqin Zhang, Xia Tian, Zhaoxiang Han, Xiaoqing Lu, Kunpeng Guo, Zhike Liu, Zhongqiang Wang
Two spiroannulated molecular structures with dithiafulvenyl units functionalized at the 2,2',7,7'- (SFX-DTF1) and 2,3',6,'7- (SFX-DTF2) positions of a spiro[fluorene-9,9'-xanthene] core were synthesized. Studies revealed the hole mobility was significantly influenced by the dithiafulvenyl functionalized positions in the molecular structure. To explore their primary applications as hole-transporting materials in perovskite solar cells, SFX-DTF1-based devices exhibited a power conversion efficiency of 10.67% without the use of p-type dopants, yielding good air stability...
January 18, 2018: Organic Letters
https://www.readbyqxmd.com/read/29345454/stability-and-performance-of-cspbi2br-thin-films-and-solar-cell-devices
#6
Silvia Mariotti, Oliver S Hutter, Laurie J Phillips, Peter J Yates, Biswajit Kundu, Ken Durose
In this manuscript, the inorganic perovskite CsPbI2Br is investigated as a photovoltaic material that offers higher stability than the organic-inorganic hybrid perovskite materials. It is demonstrated that CsPbI2Br does not irreversibly degrade to its component salts as in the case of methylammonium lead iodide but instead is induced (by water vapor) to transform from its metastable brown cubic (1.92 eV band gap) phase to a yellow phase having a higher band gap (2.85 eV). This is easily reversed by heating to 350 °C in a dry environment...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29343067/practical-efficiency-limit-of-methylammonium-lead-iodide-perovskite-ch3nh3pbi3-solar-cells
#7
Ahmer A B Baloch, M I Hossain, N Tabet, F H Alharbi
No abstract text is available yet for this article.
January 18, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29342950/recent-advances-of-rare-earth-ion-doped-luminescent-nanomaterials-in-perovskite-solar-cells
#8
REVIEW
Yu Qiao, Shuhan Li, Wenhui Liu, Meiqing Ran, Haifei Lu, Yingping Yang
Organic-inorganic lead halide based perovskite solar cells have received broad interest due to their merits of low fabrication cost, a low temperature solution process, and high energy conversion efficiencies. Rare-earth (RE) ion doped nanomaterials can be used in perovskite solar cells to expand the range of absorption spectra and improve the stability due to its upconversion and downconversion effect. This article reviews recent progress in using RE-ion-doped nanomaterials in mesoporous electrodes, perovskite active layers, and as an external function layer of perovskite solar cells...
January 15, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29340377/metal-organic-frameworks-at-interfaces-of-hybrid-perovskite-solar-cells-for-enhanced-photovoltaic-properties
#9
Deli Shen, Aiying Pang, Yafeng Li, Jie Dou, Mingdeng Wei
In this study, metal-organic frameworks, as an interfacial layer, were introduced into perovskite solar cells (PSCs) for the first time. An interface modified with the metal-organic framework ZIF-8 efficiently enhanced perovskite crystallinity and grain sizes, and the photovoltaic performance of the PSCs was significantly improved, resulting in a maximum PCE of 16.99%.
January 17, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29338175/limitations-of-cs3bi2i9-as-lead-free-photovoltaic-absorber-materials
#10
Biplab Ghosh, Bo Wu, Hemant Kumar Mulmudi, Claude Guet, Klaus Weber, Tze Chien Sum, Subodh G Mhaisalkar, Nripan Mathews
Lead (Pb) halide perovskites have attracted tremendous attention in recent years due to their rich optoelectronic properties, which have resulted in more than 22% power conversion efficient photovoltaics. Nevertheless, Pb-metal toxicity remains a huge hurdle for extensive applications of these compounds. Thus, alternative compounds with similar optoelectronic properties need to be developed. Bismuth possesses similar electronic structure as that of lead with the presence of ns2 electrons that exhibit rich structural variety as well as interesting optical and electronic properties...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29336353/perovskite-nanocrystals-across-dimensional-attachment-film-scale-assembly-on-flexible-substrate-and-their-fluorescence-properties
#11
Wenyi Huang, Jiajia Liu, Bing Bai, Liu Huang, Meng Xu, Jia Liu, Hongpan Rong, Jiatao Zhang
Perovskite nanocrystals (NCs), a good fluorescent candidate for excellent photoelectric properties, have opened new avenues in the fabrication of highly efficient solar cells, light-emitting diodes (LEDs), and other optoelectronic devices. Further advances will rely on the multitude of compositional, structural variants that enable the formation of lower-dimensionality layered and three-dimensional (3D) perovskites with architectural innovations. In this work, the perovskite film was fabricated on the flexible substrate by simple dip-coating technology and 3D assemblies of perovskite NCs were obtained through an attachment process...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29336155/highly-bendable-flexible-perovskite-solar-cells-on-a-nanoscale-surface-oxide-layer-of-titanium-metal-plates
#12
Gill Sang Han, Seongha Lee, Matthew Duff, Fen Qin, Jung-Kun Lee
We report highly bendable and efficient perovskite solar cells (PSCs) that use thermally oxidized layer of Ti metal plate as an electron transport layer (ETL). The power conversion efficiency (PCE) of flexible PSCs reaches 14.9 % with short-circuit current density (Jsc) of 17.9 mA/cm2, open circuit voltage (Voc) of 1.09, and fill factor (ff) of 0.74. Moreover, the Ti metal based PSCs exhibit a superior fatigue resistance over ITO/PEC substrate. Flexible PSCs maintain 100 % of their initial PCE even after PSCs are bent 1000 times at the bending radius of 4 mm...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29333763/polymer-passivated-inorganic-cesium-lead-mixed-halide-perovskites-for-stable-and-efficient-solar-cells-with-high-open-circuit-voltage-over-1-3-v
#13
Qingsen Zeng, Xiaoyu Zhang, Xiaolei Feng, Siyu Lu, Zhaolai Chen, Xue Yong, Simon A T Redfern, Haotong Wei, Haiyu Wang, Huaizhong Shen, Wei Zhang, Weitao Zheng, Hao Zhang, John S Tse, Bai Yang
Cesium-based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (Eloss ) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2 Br absorber and polythiophene hole-acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2 Br, can significantly reduce electron-hole recombination within the perovskite, which is due to the electronic passivation of surface defect states...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29328210/nonlinear-absorption-and-temperature-dependent-fluorescence-of-perovskite-fapbbr3-nanocrystal
#14
Lan Yang, Ke Wei, Zhongjie Xu, Feiming Li, Runze Chen, Xin Zheng, Xiangai Cheng, Tian Jiang
Recent progress in solar cell and light-emitting devices makes halide perovskite a research hot spot in optics. In this Letter, the nonlinear absorption and fluorescence properties of FAPbBr3 nanocrystal, one typical organometallic halide perovskite, have been investigated via Z-scan measurements and a density-dependent photoluminescence (PL) spectrum. The FAPbBr3 nanocrystal exhibits nonlinear absorption under the excitation of 800 nm, whose photon energy is below the bandgap of FAPbBr3. The significant absorption is experimentally confirmed to be induced by two-photon absorption (TPA), and the TPA coefficient is measured to be ∼0...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327744/spinel-co3o4-nanomaterials-for-efficient-and-stable-large-area-carbon-based-printed-perovskite-solar-cells
#15
Amna Bashir, Sudhanshu Shukla, Jia Haur Lew, Shashwat Shukla, Annalisa Bruno, Disha Gupta, Tom Baikie, Rahul Patidar, Zareen Akhter, Anish Priyadarshi, Nripan Mathews, Subodh G Mhaisalkar
Carbon based perovskite solar cells (PSCs) are fabricated through easily scalable screen printing techniques, using abundant and cheap carbon to replace the hole transport material (HTM) and the gold electrode further reduces costs, and carbon acts as a moisture repellent that helps in maintaining the stability of the underlying perovskite active layer. An inorganic interlayer of spinel cobaltite oxides (Co3O4) can greatly enhance the carbon based PSC performance by suppressing charge recombination and extracting holes efficiently...
January 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/29327311/sequentially-vapor-grown-hybrid-perovskite-for-planar-heterojunction-solar-cells
#16
Won-Gyu Choi, Dong-Won Kang, Sungjae Na, Chan-Gyu Park, Fatma Pinar Gokdemir, Taeho Moon
High-quality and reproducible perovskite layer fabrication routes are essential for the implementation of efficient planar solar cells. Here, we introduce a sequential vapor-processing route based on physical vacuum evaporation of a PbCl2 layer followed by chemical reaction with methyl-ammonium iodide vapor. The demonstrated vapor-grown perovskite layers show compact, pinhole-free, and uniform microstructure with the average grain size of ~ 320 nm. Planar heterojunction perovskite solar cells are fabricated using TiO2 and spiro-OMeTAD charge transporting layers in regular n-i-p form...
January 11, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29323220/an-efficient-flexible-perovskite-solar-module-exceeding-8-prepared-with-an-ultrafast-pbi2-deposition-rate
#17
Kunpeng Li, Junyan Xiao, Xinxin Yu, Tianhui Li, Da Xiao, Jiang He, Peng Zhou, Yangwen Zhang, Wangnan Li, Zhiliang Ku, Jie Zhong, Fuzhi Huang, Yong Peng, Yibing Cheng
Large-area, pinhole-free CH3NH3PbI3 perovskite thin films were successfully fabricated on 5 cm × 5 cm flexible indium tin oxide coated polyethylene naphthalate (ITO-PEN) substrates through a sequential evaporation/spin-coating deposition method in this research. The influence of the rate-controlled evaporation of PbI2 films on the quality of the perovskite layer and the final performance of the planar-structured perovskite solar cells were investigated. An ultrafast evaporation rate of 20 Å s-1 was found to be most beneficial for the conversion of PbI2 to CH3NH3PbI3 perovskite...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29318870/improving-the-optoelectronic-properties-of-mesoporous-tio2-by-cobalt-doping-for-high-performance-hysteresis-free-perovskite-solar-cells
#18
Siraj Sidhik, Andrea Cerdan-Pasaran, Diego Esparza, Tzarara Lopez-Luke, Ramon Carriles, Elder De La Rosa
We for the first time report the incorporation of cobalt into a mesoporous TiO2 electrode for application in perovskite solar cells (PSCs).The Co-doped PSC exhibits excellent optoelectronic properties; we explain the improvements by passivation of electronic trap or sub-band gap states arising due to the oxygen vacancies in pristine-TiO2, enabling faster electron transport and collection. A simple post-annealing treatment is used to prepare the cobalt-doped mesoporous electrode; UV-vis, XPS, SCLC, photoluminescence and electrochemical impedance measurements confirm the incorporation of cobalt, enhanced conductivity and the passivation effect induced in the TiO2...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29318712/argon-plasma-treatment-to-tune-perovskite-surface-composition-for-high-efficiency-solar-cells-and-fast-photodetectors
#19
Xun Xiao, Chunxiong Bao, Yanjun Fang, Jun Dai, Benjamin R Ecker, Congcong Wang, Yuze Lin, Shi Tang, Ye Liu, Yehao Deng, Xiaopeng Zheng, Yongli Gao, Xiao Cheng Zeng, Jinsong Huang
The surface composition of perovskite films is very sensitive to film processing and can deviate from the optimal, which generates unfavorable defects and results in efficiency loss in solar cells and slow response speed in photodetectors. An argon plasma treatment is introduced to modify the surface composition by tuning the ratio of organic and inorganic components as well as defect type before deposition of the passivating layer. It can efficiently enhance the charge collection across the perovskite-electrode interface by suppressing charge recombination...
January 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29318465/fabrication-of-semiconducting-methylammonium-lead-halide-perovskite-particles-by-spray-technology
#20
Mohammad-Reza Ahmadian-Yazdi, Morteza Eslamian
In this "nano idea" paper, three concepts for the preparation of methylammonium lead halide perovskite particles are proposed, discussed, and tested. The first idea is based on the wet chemistry preparation of the perovskite particles, through the addition of the perovskite precursor solution to an anti-solvent to facilitate the precipitation of the perovskite particles in the solution. The second idea is based on the milling of a blend of the perovskite precursors in the dry form, in order to allow for the conversion of the precursors to the perovskite particles...
January 10, 2018: Nanoscale Research Letters
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