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Perovskite solar cells

Chengwu Yang, Mingyu Yu, Dichun Chen, Yaqing Zhou, Wei Wang, Yang Li, Tung-Chun Lee, Daqin Yun
A facile aqueous-based fabrication scheme is developed for producing annealing-free anatase TiO2 (AF-TiO2) films that exhibit efficient electron transport properties in planar heterojunction perovskite solar cells (PSCs). AF-TiO2 films are fabricated by spin coating on a substrate a colloidal solution of anatase TiO2 nanoparticles (NPs) prepared via a low temperature hydrolytic sol-gel method. The resultant AF-TiO2 films show low electrical resistance, high transmittance in the visible and near-infrared regions and facilitation of high-quality perovskite film formation, which can be attributed to their homogeneous surface morphology and nanocrystallinity...
June 21, 2017: Chemical Communications: Chem Comm
Fatemeh Behrouznejad, Cheng-Min Tsai, Sudhakar Narra, Eric W-G Diau, Nima Taghavinia
Solar cells with high-efficiency, low-cost and high-stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multi-layer mesoporous structure...
June 20, 2017: ACS Applied Materials & Interfaces
Giulia Grancini, Daniele Viola, Yonghui Lee, Michael Saliba, Sanghyun Paek, Kyung Taek Cho, Simonetta Orlandi, Marco Cavazzini, Fernando Fungo, Mohammad I Hossain, Abdelhak Belaidi, Nouar Tabet, Gianluca Pozzi, Giulio Cerullo, Mohammad Khaja Khaja Nazeeruddin
With power conversion efficiency (PCE) exceeding 22%, perovskite solar cells (PSCs) have thrilled the photovoltaic research. However, interface behavior is still not understood and a hot subject of research: different processes occur over a hierarchy of timescales, from femtoseconds to seconds, making the perovskite interface physics intriguing. Here, by femtosecond transient absorption spectroscopy with spectral coverage extended to the crucial IR region, we interrogate the ultrafast interface- specific processes at standard as well as newly molecularly-engineered perovskite interfaces used in state of the art PSCs...
June 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Xufeng Ling, Jianyu Yuan, Dongyang Liu, Yongjie Wang, Yannan Zhang, Si Chen, Haihua Wu, Feng Jin, Fu-Peng Wu, Guozheng Shi, Xun Tang, Jiawei Zheng, Shengzhong Frank Liu, Zhike Liu, Wanli Ma
In this work , we demonstrate high-efficiency planar perovskite solar cells (PSCs) using room-temperature sputtered niobium oxide (Nb2O5) as the electron transporting layer (ETL). Widely spread ETL like TiO2 often requires high-temperature (> 450 ºC) sintering, which is not desired for the fabrication of flexible devices. The as sputtered amorphous Nb2O5 ETL (labeled as a-Nb2O5) without any heat treatment can lead to a best power conversion efficiency (PCE) of 17.1% for planar PSCs. Interestingly, the crystalline Nb2O5 (labeled as c-Nb2O5) with high-temperature (500 ºC) annealing results in very similar PCE of 17...
June 19, 2017: ACS Applied Materials & Interfaces
Ilario Gelmetti, Lydia Cabau, Nuria F Montcada, Emilio Palomares
We have fabricated MAPI solar cells using as selective contacts PEDOT:PSS polymer for holes and PCBM-C70 fullerene derivative for electrons. The thickness of MAPI, PCBM-C70, and PEDOT:PSS layers have been varied in order to evaluate the contribution of each layer to the final device performance. We have measured the devices capacitance under illumination and the charge carrier's lifetime using photo-induced time resolved techniques. The results show that in this kind of devices the limiting layer is the PCBM-C70 due to its relative reduced mobility compared to PEDOT:PSS that makes the control of the fullerene thickness crucial for device optimization...
June 16, 2017: ACS Applied Materials & Interfaces
Tanja Ivanovska, Chiara Dionigi, Edoardo Mosconi, Filippo De Angelis, Fabiola Liscio, Vittorio Morandi, Giampiero Ruani
Charge carriers' long diffusion length in the CH3NH3PbI3 perovskite is one of the most relevant properties for explaining the high photovoltaic efficiency of perovskites solar cells. As possible mechanism for the large diffusion length of electrons and holes, several authors suggested a reduced coulomb attraction of the carriers due to the formation of polarons. Here we performed continuous wave far infrared photoinduced absorption (PIA) experiments on CH3NH3PbI3; spectral changes are associated to local deformation of the lattice around the photogenerated long lived charges, a typical signature of photo-induced polarons...
June 16, 2017: Journal of Physical Chemistry Letters
He Tang, Shengsheng He, Chuangwei Peng
Faced with the increasingly serious energy and environmental crisis in the world nowadays, the development of renewable energy has attracted increasingly more attention of all countries. Solar energy as an abundant and cheap energy is one of the most promising renewable energy sources. While high-performance solar cells have been well developed in the last couple of decades, the high module cost largely hinders wide deployment of photovoltaic devices. In the last 10 years, this urgent demand for cost-effective solar cells greatly facilitates the research of solar cells...
December 2017: Nanoscale Research Letters
Zhiyong Liu, Yan Zhong, Bo Sun, Xingyue Liu, Jinghui Han, Tielin Shi, Zirong Tang, Guanglan Liao
Power packs integrating both photovoltaic parts and energy storage parts have gained great scientific and technological attention due to the increasing demand for green energy and the tendency for miniaturization and multi-functionalization in electronics industry. In this study we demonstrate novel integration of perovskite solar cell and solid-state supercapacitor for power packs. Perovskite solar cell is integrated with the supercapacitor based on the common carbon electrodes to hybridize photoelectric conversion and energy storage...
June 14, 2017: ACS Applied Materials & Interfaces
Like Huang, Xiaoxiang Sun, Chang Li, Jie Xu, Rui Xu, Yangyang Du, Jian Ni, Hongkun Cai, Juan Li, Ziyang Hu, Jianjun Zhang
Recently, low-temperature solution-processed tin oxide (SnO2) as versatile electron transport layer (ETL) for efficient and robust planar heterojunction (PH) perovskite solar cells (PSCs) has attracted particular attention due to its outstanding properties such as high optical transparency, high electron mobility, and suitable band alignment. However, for most of the reported works, an annealing temperature of 180 °C is generally required. This temperature can reluctantly said to be a low temperature, especially with respect to the flexible application where 180 °C is still a little too high that PET flexible substrate cannot bear...
June 14, 2017: ACS Applied Materials & Interfaces
Lin Yuan, Robert Patterson, Xiaoming Wen, Zhilong Zhang, Gavin Conibeer, Shujuan Huang
Cesium lead halide (CsPbX3, X=Cl, Br, I) perovskites are a new material system that has attracted a lot of research focus. Its tunable band gap and better thermal stability than organic lead halide perovskite give it the potential for applications in optoelectronic devices such as light-emitting diodes and solar cells. Here we have synthesized CsPbBr3-xIx perovskite quantum dots (QDs) via a solution process, and then have selected three different anti-solvents to purify the product. A significant effect on optical properties of CsPbBr3-xIx was found after the centrifugation process...
June 7, 2017: Journal of Colloid and Interface Science
Jae Keun Nam, Myung Sun Jung, Sung Uk Chai, Yung Ji Choi, Dongho Kim, Jong Hyeok Park
Thermal instability of organic-inorganic hybrid perovskites will be an inevitable hurdle for commercialization. Recently, all-inorganic cesium lead halide perovskites, in particular, CsPbI2Br, have emerged as thermally stable and efficient photovoltaic light absorbers. However, the fundamental properties of this material have not been studied in detail. The crystal formation behavior of CsPbI2Br is investigated by examining the surface morphology, crystal structure, and chemical state of the perovskite films...
June 14, 2017: Journal of Physical Chemistry Letters
Zhifang Shi, Yi Zhang, Chao Cui, Binghan Li, Wenjia Zhou, Zhijun Ning, Qixi Mi
Semiconducting lead triiodide perovskites (APbI3 ) have shown remarkable performance in applications including photovoltaics and electroluminescence. Despite many theoretical possibilities for A(+) in APbI3 , the current experimental knowledge is largely limited to two of these materials: methylammonium (MA(+) ) and formamidinium (FA(+) ) lead triiodides, neither of which adopts the ideal, cubic perovskite structure at room temperature. Here, a volume-based criterion is proposed for cubic APbI3 to be stable, and two perovskite materials MA1-x EAx PbI3 (MEPI, EA(+) = ethylammonium) and MA1-y DMAy PbI3 (MDPI, DMA(+) = dimethylammonium) are introduced...
June 12, 2017: Advanced Materials
Enbing Bi, Han Chen, Fengxian Xie, Yongzhen Wu, Wei Chen, Yanjie Su, Ashraful Islam, Michael Grätzel, Xudong Yang, Liyuan Han
Long-term stability is crucial for the future application of perovskite solar cells, a promising low-cost photovoltaic technology that has rapidly advanced in the recent years. Here, we designed a nanostructured carbon layer to suppress the diffusion of ions/molecules within perovskite solar cells, an important degradation process in the device. Furthermore, this nanocarbon layer benefited the diffusion of electron charge carriers to enable a high-energy conversion efficiency. Finally, the efficiency on a perovskite solar cell with an aperture area of 1...
June 12, 2017: Nature Communications
Weiwei Meng, Xiaoming Wang, Zewen Xiao, Jianbo Wang, David B Mitzi, Yanfa Yan
Using density functional theory calculations, we analyze the optical absorption properties of lead (Pb)-free metal halide perovskites (AB(2+)X3) and double perovskites (A2B(+)B(3+)X6) (A = Cs or monovalent organic ion, B(2+) = non-Pb divalent metal, B(+) = monovalent metal, B(3+) = trivalent metal, X = halogen). We show that if B(2+) is not Sn or Ge, Pb-free metal halide perovskites exhibit poor optical absorptions because of their indirect band gap nature. Among the nine possible types of Pb-free metal halide double perovskites, six have direct band gaps...
June 16, 2017: Journal of Physical Chemistry Letters
Yingguo Yang, Shanglei Feng, Weidong Xu, Meng Li, Li Li, Xingmin Zhang, Gengwu Ji, Xiaonan Zhang, Zhao-Kui Wang, Yimin Xiong, Liang Cao, Baoquan Sun, Xingyu Gao
Despite of rapid successful developments towards promising perovskite solar cells (PSCs) efficiency, they often suffer significant hysteresis effects. Using synchrotron-based grazing incidence X-ray diffraction (GIXRD) with different probing depths by varying the incident angle, we found that the perovskite films consist of dual phases with a parent phase dominant in the interior and a child phase with a smaller (110) inter-planar space (d(110)) after rapid thermal annealing (RTA) which is a widely used post-treatment to improve the crystallization of solution processed perovskite films for high-performance planar PSCs...
June 12, 2017: ACS Applied Materials & Interfaces
Cheng Bi, Bo Chen, Haotong Wei, Stephan DeLuca, Jinsong Huang
Organic-inorganic hybrid perovskites (OIHPs) are new photoactive layer candidates for lightweight and flexible solar cells due to their low-temperature process capability; however, the reported efficiency of flexible OIHP devices is far behind those achieved on rigid glass substrates. Here, it is revealed that the limiting factor is the different perovskite film deposition conditions required to form the same film morphology on flexible substrates. An optimized perovskite film composition needs a different precursor ratio, which is found to be essential for the formation of high-quality perovskite films with longer radiative carrier recombination lifetime, smaller density of trap states, reduced precursor residue, and uniform and pin-hole free films...
June 9, 2017: Advanced Materials
Yongping Fu, Tao Wu, Jue Wang, Jianyuan Zhai, Melinda J Shearer, Yuzhou Zhao, Robert J Hamers, Erjun Kan, Kaiming Deng, Xiaoyang Zhu, Song Jin
Metastable structural polymorphs can have superior properties and applications than their thermodynamically stable phases but rational synthesis of metastable phases is a challenge. Here, a new strategy for stabilizing metastable phases using surface functionalization is demonstrated using the example of formamidinium lead iodide (FAPbI3) perovskite, which is metastable at room temperature (RT) but holds great promises in solar and light-emitting applications. We show that through surface ligand functionalization during direct solution growth at RT, pure FAPbI3 in the cubic perovskite phase can be stabilized in nanostructures and thin films at RT without cation or anion alloying...
June 8, 2017: Nano Letters
Haoxu Wang, Jie Lei, Fei Gao, Zhou Yang, Dong Yang, Jiexuan Jiang, Juan Li, Xihong Hu, Xiaodong Ren, Bin Liu, Jing Liu, Hairui Lei, Zhike Liu, Shengzhong Liu
Perovskite solar cells (PSCs) are promising low-cost photovoltaic technologies with high power conversion efficiency (PCE). The crystalline quality of perovskite materials is crucial to the photovoltaic performance of the PSCs. Here, a simple approach is introduced to prepare high quality CH3NH3PbI3 perovskite films with larger crystalline grains and longer carriers lifetime by using magnetic field to control the nucleation and crystal growth. The fabricated planar CH3NH3PbI3 solar cells have an average PCE of 17...
June 7, 2017: ACS Applied Materials & Interfaces
Yevgeny Rakita, Omri Bar-Elli, Elena Meirzadeh, Hadar Kaslasi, Yagel Peleg, Gary Hodes, Igor Lubomirsky, Dan Oron, David Ehre, David Cahen
Halide perovskite (HaP) semiconductors are revolutionizing photovoltaic (PV) solar energy conversion by showing remarkable performance of solar cells made with HaPs, especially tetragonal methylammonium lead triiodide (MAPbI3). In particular, the low voltage loss of these cells implies a remarkably low recombination rate of photogenerated carriers. It was suggested that low recombination can be due to the spatial separation of electrons and holes, a possibility if MAPbI3 is a semiconducting ferroelectric, which, however, requires clear experimental evidence...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
Da Hyun Song, Ho-Sub Kim, Jung Sang Suh, Bong-Hyun Jun, Won-Yeop Rho
The use of dye-sensitized solar cells (DSSCs) is widespread owing to their high power conversion efficiency (PCE) and low cost of manufacturing. We prepared multi-shaped Ag nanoparticles (NPs) and introduced them into DSSCs to further enhance their PCE. The maximum absorption wavelength of the multi-shaped Ag NPs is 420 nm, including the shoulder with a full width at half maximum (FWHM) of 121 nm. This is a broad absorption wavelength compared to spherical Ag NPs, which have a maximum absorption wavelength of 400 nm without the shoulder of 61 nm FWHM...
June 4, 2017: Nanomaterials
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