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

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;
Huazhong University of Science and Technology; Tokyo Institute of Technology; Huazhong University of Science and Technology; Huazhong University of Science and Technology; the Chinese University of Hong Kong; Dalian Institute of Chemical Physics; Huazhong University of Science and Technology; Huazhong University of Science and Technology; Huazhong University of Science and Technology; the Chinese University of Hong Kong; Dalian Institute of Chemical Physics; Huazhong University of Science and Technology; Tokyo Institute of Technology; Huazhong University of Science and Technology
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Publisher: ACS
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Abstract AITranslate

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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DOI：https://doi.org/10.1021/acsenergylett.9b00403

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Citation Information:

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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GB/T 7714-2015 [1] Youyu Jiang, Xinyi He, Tiefeng Liu, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b00403.
MLA [1] Youyu Jiang, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b00403.
APA [1] 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. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b00403
IEEE [1] 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, and Yinhua Zhou, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b00403.