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Perovskite solar cells

Zhong-Ning Chen, Aiying Pang, Deli Shen, Mingdeng Wei
Developing ternary metal oxides as electron transporting layers (ETL) for perovskite solar cell is highly challenging in the field of third-generation photovoltaics. In this study, highly mesoporous zinc titanate oxide (Zn2Ti3O8) scaffold synthesized by ion-exchange method has been successfully used as ETL for the fabrication of methyl ammonium lead halide (CH3NH3PbI3) perovskite solar cells. The optimized devices exhibit 17.21% power conversion efficiency (PCE) with open circuit voltage (Voc) of 1.02 V, short-circuit current density (Jsc) of 21...
November 21, 2017: ChemSusChem
Guanhaojie Zheng, Cheng Zhu, Yihua Chen, Juchen Zhang, Qi Chen, Xingyu Gao, Huanping Zhou
We systematically investigated the impact of stoichiometric ratio variation between PbX2 and AX on hybrid perovskite films from the perspective of microstructure, especially on the plane stacking directions, using the two-dimensional synchrotron radiation grazing incidence wide-angle X-ray scattering (GIWAXS) technique. The tuned crystal plane stacking in perovskite films can consequently enlighten further explorations about the relationship between microstructure and solar cell performance.
November 21, 2017: Chemical Communications: Chem Comm
Weitao Shan, Wissam A Saidi
Native point and grain boundary (GB) defects are ubiquitous in methylammonium lead iodide (MAPbI3) sensitizers employed in solar cells that are polycrystalline in nature. Here we use density functional theory (DFT) in conjunction with a thermodynamic approach to determine the stability and electronic properties of all native point defects and their interplays with Σ5-(210) GB in MAPbI3. The transition levels of charged defects are investigated with inclusion of electrostatic charge corrections and spin-orbit coupling...
November 21, 2017: Journal of Physical Chemistry Letters
Jingjing Zhao, Yehao Deng, Haotong Wei, Xiaopeng Zheng, Zhenhua Yu, Yuchuan Shao, Jeffrey E Shield, Jinsong Huang
Organic-inorganic hybrid perovskite (OIHP) solar cells have achieved comparable efficiencies to those of commercial solar cells, although their instability hinders their commercialization. Although encapsulation techniques have been developed to protect OIHP solar cells from external stimuli such as moisture, oxygen, and ultraviolet light, understanding of the origin of the intrinsic instability of perovskite films is needed to improve their stability. We show that the OIHP films fabricated by existing methods are strained and that strain is caused by mismatched thermal expansion of perovskite films and substrates during the thermal annealing process...
November 2017: Science Advances
Paifeng Luo, Shengwen Zhou, Yugang Zhou, Wei Xia, Lin Sun, Jigui Cheng, Chenxi Xu, Yingwei Lu
Over the past few years, significant attention has been focused on HC(NH2)2PbI3 (FAPbI3) perovskite due to their reduced band gap and enhanced thermal stability compared with the most studied CH3NH3PbI3 (MAPbI3). However, FAPbI3 is sensitive to moisture and also encounters serious structural phase-transition from photoactive -phase to photoinactive -phase. Herein, we first develop a novel FAI gas-phase assisted mixed-cation compositional modulation method to fabricate CsxFA1-xPbI3 perovskite solar cells (PSCs), and realize the structural stabilization of -phase FAPbI3 with the incorporation of smaller inorganic Cs+ ions...
November 20, 2017: ACS Applied Materials & Interfaces
Felix Lang, Oleksandra Shargaieva, Viktor V Brus, Heinz C Neitzert, Jörg Rappich, Norbert H Nickel
Organic-inorganic perovskites are well suited for optoelectronic applications. In particular, perovskite single and perovskite tandem solar cells with silicon are close to their market entry. Despite their swift rise in efficiency to more than 21%, solar cell lifetimes are way below the needed 25 years. In fact, comparison of the time when the device performance has degraded to 80% of its initial value (T80 lifetime) of numerous solar cells throughout the literature reveals a strongly reduced stability under illumination...
November 20, 2017: Advanced Materials
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
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
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
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
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
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
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
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
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
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
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
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
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
Rebecca A Scheidt, Gergely F Samu, Csaba Janáky, Prashant V Kamat
The charging of a 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 to +0.6 V vs Ag/AgCl...
November 21, 2017: Journal of the American Chemical Society
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