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perovskite solar cell

Alison E Lewis, Yi Zhang, Peng Gao, Mohammad Khaja Nazeeruddin
In order to achieve high efficiency perovskite solar cells, understanding both the crystal structure and the opto-electronic properties of perovskite layers are of importance. This paper uses crystallization analysis and modelling study of two different perovskites deposition methods (two-step and one-step methods) and thereby shows that the one-step method embodies a film formation process that is dominated by crystal growth, while the dominant mechanism of the two-step procedure is nucleation. Our data based on the experimental and the theory shows that the one-step recipe is superior in terms of morphology control and hence the reproducibility compared to the two-step recipe...
July 19, 2017: ACS Applied Materials & Interfaces
Man Yu, Hao-Yi Wang, Ming-Yang Hao, Yujun Qin, Li-Min Fu, Jian-Ping Zhang, Xi-Cheng Ai
Perovskite solar cells have emerged as promising photovoltaic systems with superb power conversion efficiency. For the practical application of perovskite devices, the greatest concerns are the power output density and the related dynamics under working conditions. In this study, the working conditions of planar and mesoscopic perovskite solar cells are simulated and the power output density evolutions with the working voltage are highlighted. The planar device exhibits higher capability of outputting power than the mesoscopic one...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Yaroslav B Martynov, Rashid G Nazmitdinov, Andreu Moià-Pol, Pavel P Gladyshev, Alexey R Tameev, Anatoly V Vannikov, Mihal Pudlak
Organometal triiodide perovskites are promising, high-performance absorbers in solar cells. Considering the perovskite as a thin film absorber, we solve transport equations and analyse the efficiency of a simple heterojunction configuration as a function of electron-hole diffusion lengths. We found that for a thin film thickness of ≃1 μm the maximum efficiency of ≃31% could be achieved at the diffusion length of ∼100 μm.
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Jionghua Wu, Xin Xu, Yanhong Zhao, Jiangjian Shi, Yuzhuan Xu, Yanhong Luo, Dongmei Li, Huijue Wu, Qingbo Meng
DMF as additive has been employed in FAI/MAI/IPA (FA= CH2 (NH2)2, MA=CH3NH3, IPA is isopropanol) solution for two-step multi-cycle spin coating method in order to prepare high quality FAxMA1-xPbI2.55Br0.45 perovskite films. Further investigation reveals that the existence of DMF in the FAI/MAI/IPA solution can facilitate perovskite conversion, improve the film morphology and reduce crystal defects, thus enhance charge transfer efficiency. By optimization toward the DMF amount and spin coating cycles, compact, pinhole-free perovskite films are obtained...
July 19, 2017: ACS Applied Materials & Interfaces
Abdullah Al Mamun, Tanzila Tasnim Ava, Hye Ryung Byun, Hyeon Jun Jeong, Mun Seok Jeong, Loi Nguyen, Christine Gausin, Gon Namkoong
While organo-inorganic halide perovskite solar cells show great potential to meet future energy needs, their thermal instability raises serious questions about their commercialization viability. At present, the stability of perovskite solar cells has been studied under various environmental conditions including humidity and temperature. Nonetheless, understanding of the performance of CH3NH3PbI3-xClx perovskite solar cells is limited. This study reports the irreversible performance degradation of CH3NH3PbI3-xClx perovskite solar cells during the heating and cooling processes under AM 1...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
Fei Qin, Wei Meng, Jiacheng Fan, Chang Ge, Bangwu Luo, Ru Ge, Lin Hu, Fangyuan Jiang, Tiefeng Liu, Youyu Jiang, Yinhua Zhou
Hydroxyl groups on the surface of ZnO films lead to chemical decomposition of CH3NH3PbI3 perovskite films during thermal annealing, which limits the application of ZnO as a facile electron-transporting layer in perovskite solar cells. In this work, we report a new recipe that leads to substantially reduced hydroxyl groups on the surface of the resulting ZnO films by employing polyethylenimine (PEI) to replace generally-used ethanolamine in the precursor solutions. Films derived from the PEI-containing precursors are denoted as P-ZnO and those from the ethanoamine-containing precursors as E-ZnO...
July 17, 2017: ACS Applied Materials & Interfaces
Sanghyun Paek, Peng Qin, Yonghui Lee, Kyung Taek Cho, Peng Gao, Giulia Grancini, Emad Oveisi, Paul Gratia, Kasparas Rakstys, Shaheen A Al-Muhtaseb, Christian Ludwig, Jaejung Ko, Mohammad Khaja Nazeeruddin
Molecularly engineered novel dopant-free hole-transporting materials for perovskite solar cells (PSCs) combined with mixed-perovskite (FAPbI3 )0.85 (MAPbBr3 )0.15 (MA: CH3 NH3(+) , FA: NH=CHNH3(+) ) that exhibit an excellent power conversion efficiency of 18.9% under AM 1.5 conditions are investigated. The mobilities of FA-CN, and TPA-CN are determined to be 1.2 × 10(-4) cm(2) V(-1) s(-1) and 1.1 × 10(-4) cm(2) V(-1) s(-1) , respectively. Exceptional stability up to 500 h is measured with the PSC based on FA-CN...
July 17, 2017: Advanced Materials
Bich Phuong Nguyen, Gee Yeong Kim, William Jo, Byeong Jo Kim, Hyun Suk Jung
The electrical properties of CH3NH3Pb(I1-x Br x )3 (x = 0.13) perovskite materials were investigated under ambient conditions. The local work function and the local current were measured using Kelvin probe force microscopy and conductive atomic force microscopy, respectively. The degradation of the perovskite layers depends on their grain size. As the material degrades, an additional peak in the surface potential appears simultaneously with a sudden increase and subsequent relaxation of the local current. The potential bending at the grain boundaries and the intragrains is the most likely reason for the change of the local current surface of the perovskite layers...
July 14, 2017: Nanotechnology
Fei Ye, Wentao Tang, Fengxian Xie, Maoshu Yin, Jinjin He, Yanbo Wang, Han Chen, Yinghuai Qiang, Xudong Yang, Liyuan Han
Large-scale high-quality perovskite thin films are crucial to produce high-performance perovskite solar cells. However, for perovskite films fabricated by solvent-rich processes, film uniformity can be prevented by convection during thermal evaporation of the solvent. Here, a scalable low-temperature soft-cover deposition (LT-SCD) method is presented, where the thermal convection-induced defects in perovskite films are eliminated through a strategy of surface tension relaxation. Compact, homogeneous, and convection-induced-defects-free perovskite films are obtained on an area of 12 cm(2) , which enables a power conversion efficiency (PCE) of 15...
July 14, 2017: Advanced Materials
Rohit Prasanna, Aryeh Gold-Parker, Tomas Leijtens, Bert Conings, Aslihan Babayigit, Hans-Gerd Boyen, Michael F Toney, Michael D McGehee
Tin and lead iodide perovskite semiconductors of the composition AMX3, where M is a metal and X is a halide, are leading candidates for high efficiency low cost tandem photovoltaics, in part because they have band gaps that can be tuned over a wide range by compositional substitution. We experimentally identify two competing mechanisms through which the A-site cation influences the band gap of 3D metal halide perovskites. Using a smaller A-site cation can distort the perovskite lattice in two distinct ways: by tilting the MX6 octahedra, or by simply contracting the lattice isotropically...
July 13, 2017: Journal of the American Chemical Society
Ravi K Misra, Bat-El Cohen, Lior Iagher, Lioz Etgar
Three-dimensional (3D) perovskite has attracted a lot of attention due to its success in photovoltaic (PV) solar cells. However, one the major crucial issues lies in its stability, which has limited its commercialization. An important property of organic-inorganic perovskite is the possibility of forming a layered material using long organic cations that do not fit into the octahedral cage. The long organic cation acts as a "barrier" that "caps" the 3D perovskite forming the layered material. Controlling the number of perovskite layers could provide a confined structure with different chemical and physical properties than 3D perovskite has...
July 13, 2017: ChemSusChem
Lei Shi, Trevor L Young, Jincheol Kim, Yun Sheng, Lei Wang, Yifeng Chen, Zhiqiang Feng, Mark Keevers, Xiaojing Hao, Pierre Verlinden, Martin A Green, Anita W Y Ho-Baillie
Metal halide perovskite solar cells (PSCs) have undergone rapid progress. However, unstable performance caused by sensitivity to environmental moisture and high temperature is a major impediment to commercialisation of PSCs. In the present work, a low temperature, glass-glass encapsulation technique using polyisobutylene (PIB) as the moisture barrier is investigated on planar glass/FTO/TiO2/FAPbI3/PTAA/gold perovskite solar cells. PIB was applied as either an edge seal or blanket layer. Electrical connections to the encapsulated PSCs were provided by either the FTO or Au layers...
July 12, 2017: ACS Applied Materials & Interfaces
Yoon Ho Choi, Hyun Bin Kim, In Seok Yang, Sang Do Sung, Young Sik Choi, Jeongho Kim, Wan In Lee
Thin films of a heteropolytungstate, lithium silicotungstate (Li4SiW12O40, termed Li-ST), prepared by a solution process at low temperature, were successfully applied as electron transporting layer (ETL) of planar-type perovskite solar cells (PSCs). Dense and uniform Li-ST films were prepared on the FTO glass by depositing a thin Li-ST buffer layer, followed by coating of a main Li-ST layer. The film thickness was controlled by varying the number of coating cycles, consisting of spin-coating and thermal treatment at 150(o)C...
July 12, 2017: ACS Applied Materials & Interfaces
Mu Chen, Muhamad Z Mokhtar, Eric Whittaker, Qing Lian, Bruce Hamilton, Paul O'Brien, Mingning Zhu, Zhengxing Cui, Saif A Haque, Brian R Saunders
Perovskite solar cells (PSCs) are a disruptive technology that continues to attract considerable attention due to their remarkable and sustained power conversion efficiency increase. Improving PSC stability and reducing expensive hole transport material (HTM) usage are two aspects that are gaining increased attention. In a new approach, we investigate the ability of insulating polystyrene microgel particles (MGs) to increase PSC stability and replace the majority of the HTM phase. MGs are sub-micrometre crosslinked polymer particles that swell in a good solvent...
July 11, 2017: Nanoscale
Peng Huang, Zhaowei Wang, Yanfeng Liu, Kaicheng Zhang, Ligang Yuan, Yi Zhou, Bo Song, Yongfang Li
As a hole-transport layer (HTL) material, poly(3,4-ethylenedioxythiophene):polystyrene-sulfonate (PEDOT:PSS) was often criticized for its intrinsic acidity and hygroscopic effect that would in the long run affect the stability of perovskite solar cells (Pero-SCs). As alternatives, herein water-soluble two-dimensional (2D) transition metal dichalcogenides (TMDs), such as MoS2 and WS2 were used as HTLs in p-i-n Pero-SCs. It was found that the content of 1T phase in 2D TMDs HTLs is centrally important to the power conversion efficiencies (PCEs) of Pero-SCs, and the 1T-rich TMDs (as achieved from exfoliation and without postheating) lead to much higher PCEs...
July 19, 2017: ACS Applied Materials & Interfaces
Hironobu Ishibashi, Mikimasa Katayama, Senku Tanaka, Toshihiko Kaji
For the search of new metal-halide perovskite solar cell materials, tolerance factors are calculated from the ionic radius of each site and are often utilized as the critical factors to expect the materials forming perovskite structure. As one of such amine hydrohalides, guanidine hydroiodide (GI) is reported not to react with PbI2. However, in this paper, we report the product of GI and SnI2 reaction, its visible light absorption, X-ray diffraction, and its solar cell operation, in spite of the more disadvantageous tolerance factor of SnI2 than PbI2...
July 10, 2017: Scientific Reports
Jianhua Han, Xuewen Yin, Hui Nan, Yu Zhou, Zhibo Yao, Jianbao Li, Dan Oron, Hong Lin
The combination of perovskite solar cells and quantum dot solar cells has significant potential due to the complementary nature of the two constituent materials. In this study, solar cells (SCs) with a hybrid CH3 NH3 PbI3 /SnS quantum dots (QDs) absorber layer are fabricated by a facile and universal in situ crystallization method, enabling easy embedding of the QDs in perovskite layer. Compared with SCs based on CH3 NH3 PbI3 , SCs using CH3 NH3 PbI3 /SnS QDs hybrid films as absorber achieves a 25% enhancement in efficiency, giving rise to an efficiency of 16...
July 10, 2017: Small
Xinqian Zhang, Gang Wu, Shida Yang, Weifei Fu, Zhongqiang Zhang, Chen Chen, Wenqing Liu, Jielin Yan, Weitao Yang, Hongzheng Chen
Vertically oriented highly crystalline 2D layered (BA)2 (MA)n-1 Pbn I3n+1 (BA = CH3 (CH2 )3 NH3 , MA = CH3 NH3 , n = 3, 4) perovskite thin-films are fabricated with the aid of ammonium thiocyanate (NH4 SCN) additive through one-step spin-coating process. The humidity-stability of the film is certified by the almost unchanged X-ray diffraction patterns after exposed to humid atmosphere (Hr = 55 ± 5%) for 40 d. The photovoltaic devices with the structure of indium tin oxide(ITO)/poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate)/(BA)2 (MA)n-1 Pbn I3n+1 (n = 3,4)/[6,6]-phenyl-C61 -butyric acid methyl ester/Bathocuproine/Ag are fabricated...
July 10, 2017: Small
Adharsh Rajagopal, Zhibin Yang, Sae Byeok Jo, Ian L Braly, Po-Wei Liang, Hugh W Hillhouse, Alex K-Y Jen
Organic-inorganic hybrid perovskite multijunction solar cells have immense potential to realize power conversion efficiencies (PCEs) beyond the Shockley-Queisser limit of single-junction solar cells; however, they are limited by large nonideal photovoltage loss (V oc,loss ) in small- and large-bandgap subcells. Here, an integrated approach is utilized to improve the V oc of subcells with optimized bandgaps and fabricate perovskite-perovskite tandem solar cells with small V oc,loss . A fullerene variant, Indene-C60 bis-adduct, is used to achieve optimized interfacial contact in a small-bandgap (≈1...
July 10, 2017: Advanced Materials
Lynn Lee, Jangmi Baek, Kyung Sun Park, Yong-EunKoo Lee, Nabeen K Shrestha, Myung M Sung
We report a facile roll-printing method, geometrically confined lateral crystal growth, for the fabrication of large-scale, single-crystal CH3NH3PbI3 perovskite thin films. Geometrically confined lateral crystal growth is based on transfer of a perovskite ink solution via a patterned rolling mould to a heated substrate, where the solution crystallizes instantly with the immediate evaporation of the solvent. The striking feature of this method is that the instant crystallization of the feeding solution under geometrical confinement leads to the unidirectional lateral growth of single-crystal perovskites...
July 10, 2017: Nature Communications
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