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Perovskite solar cells

Jesus Idigoras, Francisco Javier Aparicio, Lidia Contreras-Bernal, Susana Ramos-Terrón, María Alcaire, Juan R Sanchez-Valencia, Ana Borras, Angel Barranco, Juan Antonio Anta
A compromise between high power conversion efficiency and long-term stability of hybrid organic-inorganic metal halide perovskite solar cells is necessary for their outdoor photovoltaic application and commercialization. Herein, a method to improve the stability of perovskite solar cells under water and moisture exposure consisting in the encapsulation of the cell with an ultrathin plasma polymer is reported. The deposition of the polymer is carried out at room temperature by the remote plasma vacuum deposition of adamantane powder...
March 19, 2018: ACS Applied Materials & Interfaces
Garam Park, In-Hwan Oh, J M Sungil Park, Jinyong Jung, Chun-Yeol You, June-Seo Kim, Yonghwan Kim, Jong Hoon Jung, Namjung Hur, Younghak Kim, J-Y Kim, Chang Seop Hong, Ki-Yeon Kim
Two dimensional layered organic-inorganic halide perovskites offer a wide variety of novel functionality such as solar cell and optoelectronics and magnetism. Self-assembly of these materials using solution process (ex. spin coating) makes crystalline thin films synthesized at ambient environment. However, flexibility of organic layer also poses a structure stability issue in perovskite thin films against environment factors (ex. moisture). In this study, we investigate the effect of solvents and moisture on structure and property in the (C6 H5 (CH2 )2 NH3 )2 (Cu, Mn)Cl4 (Cu-PEA, Mn-PEA) perovskite thin films spin-coated on Si wafer using three solvents (H2 O, MeOH, MeOH + H2 O)...
March 16, 2018: Scientific Reports
Ahmed Mourtada Elseman, Ahmed Esmail Shalan, Sajid Sajid, Mohamed Mohamed Rashad, Ali Mostafa Hassan, Meicheng Li
Toxicity as well as chemical instability issues of halide perovskites based on organic-inorganic lead-containing materials still remains the main drawbacks for perovskite solar cells (PSCs). Herein, we discuss the preparation of copper (Cu)-based hybrid materials, where we replace lead (Pb) with non-toxic Cu metal for lead free perovskite solar cells; investigate of its potential towards solar cells applications based on experimental and theoretical studies. The formation of (CH3NH3)2CuX4 [(CH3NH3)2CuCl4, (CH3NH3)2CuCl2I2, and (CH3NH3)2CuCl2Br2] were discussed in details...
March 16, 2018: ACS Applied Materials & Interfaces
Cristina Rodríguez-Seco, Lydia Cabau, Anton Vidal-Ferran, Emilio Palomares
Over hundreds of new organic semiconductor molecules have been synthesized as hole transport materials (HTMs) for perovskite solar cells. However, to date, the well-known N2 , N2 , N2' , N2' , N7 , N7 , N7' , octakis-(4-methoxyphenyl)-9,9-spirobi-[9,9'-spirobi[9 H-fluorene]-2,2',7,7'-tetramine (spiro-OMeTAD) is still the best choice for the best perovskite device performance. Nevertheless, there is a consensus that spiro-OMeTAD by itself is not stable enough for long-term stable devices, and its market price makes its use in large-scale production costly...
March 15, 2018: Accounts of Chemical Research
Juan Zhao, Zhihe Chi, Zhan Yang, Xiaojie Chen, Michael S Arnold, Yi Zhang, Jiarui Xu, Zhenguo Chi, Matthew P Aldred
Truly stretchable electronics, wherein all components themselves permit elastic deformation as the whole devices are stretched, exhibit unique advantages over other strategies, such as simple fabrication process, high integrity of entire components and intimate integration with curvilinear surfaces. In contrast to the stretchable devices using stretchable interconnectors to integrate with rigid active devices, truly stretchable devices are realized with or without intentionally employing structural engineering (e...
March 15, 2018: Nanoscale
Qinjun Sun, Shaolong Zhou, Xiaolei Shi, Xiaochun Wang, Liyan Gao, Zhanfeng Li, Yuying Hao
CuO nanowires (NWs) with the diameters ranging from 130 to 275 nm have been successfully prepared by electrospinning and calcination technique, followed by a calcination process. Inverted planar heterojunction perovskite solar cells (PSCs) with the structure of ITO/CuO NWs/PEDOT:PSS/CH3NH3PbI3/PCBM/Bphen/Ag were designed, achieving a best power conversion efficiency (PCE) of 16.87% , which is 21% improvement compared with that of the control PSCs without CuO NWs. By the characterizations of optical microscope, X-ray diffraction (XRD) and scanning electron microscopy (SEM), it is found that CuO NWs have uniform morphology and orderly arrangement...
March 15, 2018: ACS Applied Materials & Interfaces
Bo Li, Yanan Zhang, Lin Fu, Tong Yu, Shujie Zhou, Luyuan Zhang, Longwei Yin
Owing to inevitable thermal/moisture instability for organic-inorganic hybrid perovskites, pure inorganic perovskite cesium lead halides with both inherent stability and prominent photovoltaic performance have become research hotspots as a promising candidate for commercial perovskite solar cells. However, it is still a serious challenge to synthesize desired cubic cesium lead iodides (CsPbI3 ) with superior photovoltaic performance for its thermodynamically metastable characteristics. Herein, polymer poly-vinylpyrrolidone (PVP)-induced surface passivation engineering is reported to synthesize extra-long-term stable cubic CsPbI3 ...
March 14, 2018: Nature Communications
Zhao Xiaojuan, Leiming Tao, Hao Li, Wenchao Huang, Pengyu Sun, Jun Liu, Shuangshuang Liu, Qiang Sun, Zhifang Cui, Lijie Sun, Yan Shen, Yang Yang, Mingkui Wang
Organic-inorganic hybrid lead halide perovskites have been widely investigated in optoelectronics both experimentally and theoretically. The present work incorporates chemical modified graphene into nanocrystal SnO2 as electron transporting layer (ETL) for highly efficient planar perovskite solar cells. The modification of SnO2 with highly conductive two-dimensional naphthalene diimide-graphene can increase surface hydrophobicity and form van der Waals interaction between the surfactant and the organic-inorganic hybrid lead halide perovskite compounds...
March 14, 2018: Nano Letters
Luis M Pazos Outón, T Patrick Xiao, Eli Yablonovitch
Lead halide materials have seen a recent surge of interest from the photovoltaics community following the observation of surprisingly high photovoltaic performance, with opto-electronic properties similar to GaAs. This begs the question; what is the limit for the efficiency of these materials? It has been known that at 1-sun the efficiency limit of crystalline silicon is ~29%, despite the Shockley-Queisser (SQ) limit for its bandgap being ~33%, the discrepancy being due to strong Auger recombination. In this article, we show that Methyl Ammonium Lead Iodide (MAPbI3) likewise has a larger than expected Auger coefficient...
March 14, 2018: Journal of Physical Chemistry Letters
Nozomi Ito, Muhammad Akmal Kamarudin, Yaohong Zhang, Daisuke Hirotani, Qing Shen, Yuhei Ogomi, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase
Lead-based solar cells have gained ground in recent years, showing efficiency as high as 20 % which is on par with silicon solar cells. However, the toxicity of lead makes it non ideal candidate in solar cells. Alternatively, tin-based perovskites have been proposed due to their non-toxic nature and abundance in nature. Unfortunately, these solar cells suffer from low efficiency and stability. Here, we propose a new type of perovskite material based on mixed tin and germanium. The material showed a band gap around 1...
March 14, 2018: Journal of Physical Chemistry Letters
Il Jeon, Hiroshi Ueno, Seungju Seo, Kerttu Aitola, Ryosuke Nishikubo, Akinori Saeki, Hiroshi Okada, Gerrit Boschloo, Shigeo Maruyama, Yutaka Matsuo
Herein, we report use of [Li+ @C60 ]TFSI- as a dopant for spiro-MeOTAD in lead halide perovskite solar cells. This approach gave an air stability nearly 10-fold that of conventional devices using Li+ TFSI- . Such high stability is attributed to the hydrophobic nature of [Li+ @C60 ]TFSI- repelling moisture and absorbing intruding oxygen, thereby protecting the perovskite device from degradation. Furthermore, [Li+ @C60 ]TFSI- could oxidize spiro-MeOTAD without the need for oxygen. The encapsulated devices exhibited outstanding air stability for more than 1000 h while illuminated under ambient conditions...
March 13, 2018: Angewandte Chemie
Yao Liu, Zachariah A Page, Dongming Zhou, Volodimyr V Duzhko, Kevin R Kittilstved, Todd Emrick, Thomas P Russell
While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm...
February 28, 2018: ACS Central Science
Mohammad Mahdi Tavakoli, Fabrizio Giordano, Shaik M Zakeeruddin, Michael Grätzel
The solar to electric power conversion efficiency (PCE) of perovskite solar cells (PSCs) has recently reached 22.7 % exceeding that of competing thin film photovoltaics and the market leader polycrystalline silicon. Further augmentation of the PCE towards the Shockley-Queisser limit of 33.5 % warrants suppression of radiationless carrier recombination by judicious engineering of the interface between the light harvesting perovskite and the charge carrier extraction layers. Here, we introduce a mesoscopic oxide double layer as electron selective contact consisting of a scaffold of TiO2 nanoparticles covered by a thin film of SnO2, either in amorphous (a-SnO2), crystalline (c-SnO2) or nanocrystalline (quantum dot) form (SnO2-NC)...
March 12, 2018: Nano Letters
Jiankai Zhang, Hui Luo, Weijia Xie, Xuanhuai Lin, Xian Hou, Jianping Zhou, Sumei Huang, Wei Ou-Yang, Zhuo Sun, Xiaohong Chen
Planar perovskite solar cells (PSCs) that use nickel oxide (NiOx ) as a hole transport layer have recently attracted tremendous attention because of their excellent photovoltaic efficiencies and simple fabrication. However, the electrical conductivity of NiOx and the interface contact properties of the NiOx /perovskite layer are always limited for the NiOx layer fabricated at a relatively low annealing temperature. Ferrocenedicarboxylic acid (FDA) was firstly introduced to modify a p-type NiOx hole transport layer in PSCs, which obviously improves the crystallization of the perovskite layer and hole transport and collection abilities and reduces carrier recombination...
March 12, 2018: Nanoscale
Jinbiao Jia, Jihuai Wu, Jia Dong, Leqing Fan, Miaoliang Huang, Jianming Lin, Zhang Lan
Dispersible cadmium sulfide (CdS) nanoparticles are synthesized by a facile solvothermal reaction and are used for the first time as an electron transport layer (ETL) in inverted planar perovskite solar cells. The CdS ETL has superb electron extraction and transport properties, leading to a solar cell with light hysteresis and a high efficiency of 13.36%.
March 12, 2018: Chemical Communications: Chem Comm
Tianqi Niu, Jing Lu, Rahim Munir, Jianbo Li, Dounya Barrit, Xu Zhang, Hanlin Hu, Zhou Yang, Aram Amassian, Kui Zhao, Shengzhong Frank Liu
The trap states at grain boundaries (GBs) within polycrystalline perovskite films deteriorate their optoelectronic properties, making GB engineering particularly important for stable high-performance optoelectronic devices. It is demonstrated that trap states within bulk films can be effectively passivated by semiconducting molecules with Lewis acid or base functional groups. The perovskite crystallization kinetics are studied using in situ synchrotron-based grazing-incidence X-ray scattering to explore the film formation mechanism...
March 12, 2018: Advanced Materials
Chong Liu, Wenzhe Li, Cuiling Zhang, Yunping Ma, Jiandong Fan, Yaohua Mai
All-inorganic perovskite solar cells provide a promising solution to tackle the thermal instability problem of organic-inorganic perovskite solar cells. Herein, we designed an all-inorganic perovskite solar cell with novel structure (FTO/NiOx/CsPbI2Br/ZnO@C60/Ag), in which ZnO@C60 bilayer were utilized as the electron-transporting layers that demonstrated high carrier extraction efficiency and low leakage loss. Conse-quently, the as-fabricated all-inorganic CsPbI2Br perovskite solar cell yielded the power conversion efficiency (PCE) as high as 13...
March 8, 2018: Journal of the American Chemical Society
Haihua Zhang, Qing Liao, Yishi Wu, Zhaoyi Zhang, Qinggang Gao, Peng Liu, Meili Li, Jiannian Yao, Hongbing Fu
3D organic-inorganic hybrid perovskites have featured high gain coefficients through the electron-hole plasma stimulated emission mechanism, while their 2D counterparts of Ruddlesden-Popper perovskites (RPPs) exhibit strongly bound electron-hole pairs (excitons) at room temperature. High-performance solar cells and light-emitting diodes (LEDs) are reported based on 2D RPPs, whereas light-amplification devices remain largely unexplored. Here, it is demonstrated that ultrafast energy transfer along cascade quantum well (QW) structures in 2D RPPs concentrates photogenerated carriers on the lowest-bandgap QW state, at which population inversion can be readily established enabling room-temperature amplified spontaneous emission and lasing...
March 8, 2018: Advanced Materials
Taehyun Hwang, Byungho Lee, Jinhyun Kim, Sangheon Lee, Bumjin Gil, Alan Jiwan Yun, Byungwoo Park
Moving away from the high-performance achievements in organometal halide perovskite (OHP)-based optoelectronic and photovoltaic devices, intriguing features have been reported in that photocarriers and mobile ionic species within OHPs interact with light, electric fields, or a combination of both, which induces both spatial and temporal changes of optoelectronic properties in OHPs. Since it is revealed that the transport of photocarriers and the migration of ionic species are affected not only by each other but also by the inhomogeneous character, which is a consequence of the route selected to deposit OHPs, understanding the nanostructural evolution during OHP deposition, in terms of the resultant structural defects, electronic traps, and nanoscopic charge behaviors, will be valuable...
March 8, 2018: Advanced Materials
Pengjun Zhao, Manhyung Han, Wenping Yin, Xing Zhao, Seul-Gi Kim, Yaping Yan, Minwoo Kim, Young Jae Song, Nam-Gyu Park, Hyun Suk Jung
Currently, the most efficient perovskite solar cells (PSCs) mainly use planar and mesoporous titanium dioxide (TiO2) as an electron-transporting-layer (ETL). However, due to its intrinsic photocatalytic properties, TiO2 can decompose perovskite absorber and lead to poor stability under solar illumination (ultraviolet light). Herein, simplified architectural ETL-free PSC with enhanced efficiency and outstanding photostability is produced by the facile deposition of Bathocuproine (BCP) interlayer. Power conversion efficiency (PCE) of ETL-free PSC improves from 15...
March 6, 2018: ACS Applied Materials & Interfaces
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