journal article·2019-06-14

Intralayer A-Site Compositional Engineering of Ruddlesden–Popper Perovskites for Thermostable and Efficient Solar Cells

Youyu Jiang, Xinyi He, Tiefeng Liu, Nan Zhao, Minchao Qin, Junxue Liu, Fangyuan Jiang, Fei Qin, Lulu Sun, Xinhui Lu, Shengye Jin, Zewen Xiao, Toshio Kamiya, Yinhua Zhou

ACS Energy Letters· Volume 4· Issue 6
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Abstract

Layered Ruddlesden–Popper (RP) perovskites have good moisture- and photostability. However, thermal stability of the RP perovskites is still a challenge. In this work, through a joint theoretical and experimental study, we report an intralayer A-site compositional engineering strategy to enhance the thermal stability of the RP perovskite solar cells. The triple-A-site-cation BA2(MA0.76FA0.19Cs0.05)3Pb4I13 (labeled as T-RP) cells retain 80% of the initial efficiency after being stressed at a constant temperature of 85 °C for over 1400 h in the dark, which is a significant enhancement as compared to the FA-free or Cs-free double-A-site-cation reference devices. Enhanced stability is attributed to improved structural stability, film quality with larger and more compact micrometer grains, and lower trap densities of the T-RP, as compared to the double-A-site-cation RP perovskites. When appropriate excess PbI2 is introduced in the T-RP layer, a power conversion efficiency of 15.58% is obtained for RP perovskite solar cells with high thermal stability.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan

Department of Physics, the Chinese University of Hong Kong, Hong Kong, China

State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan

Funding

China Postdoctoral Science Foundation · Huazhong University of Science and Technology · National Natural Science Foundation of China · Thousand Talents Program · Hubei Province

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