論文

査読有り 国際誌
2020年5月27日

VOC Over 1.4 V for Amorphous Tin-Oxide-Based Dopant-Free CsPbI2Br Perovskite Solar Cells.

Journal of the American Chemical Society
  • Zhanglin Guo
  • ,
  • Ajay Kumar Jena
  • ,
  • Izuru Takei
  • ,
  • Gyu Min Kim
  • ,
  • Muhammad Akmal Kamarudin
  • ,
  • Yoshitaka Sanehira
  • ,
  • Ayumi Ishii
  • ,
  • Youhei Numata
  • ,
  • Shuzi Hayase
  • ,
  • Tsutomu Miyasaka

142
21
開始ページ
9725
終了ページ
9734
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/jacs.0c02227
出版者・発行元
American Chemical Society ({ACS})

CsPbI2Br perovskite solar cells have attracted much attention because of the rapid development in their efficiency and their great potential as a top cell of tandem solar cells. However, the VOC outputs observed so far in most cases are far from that desired for a top cell. Up to now, with various kinds of treatments, the reported champion VOC is only 1.32 V, with a VOC deficit of 0.60 V. In this work, we found that aging of the SnCl2 precursor solution for the electron-transporting layer can promote the VOC of CsPbI2Br solar cells by employing a dopant-free-polymer hole transport material (HTM) over 1.40 V and efficiency over 15.5% with high reproducibility. With the champion VOC of 1.43 V, the VOC deficit was reduced to <0.50 V, which is achieved for the first time. This simple technique of SnCl2 solution aging forms a uniform and smooth amorphous SnO
x
film with pure Sn4+, elevates the conduction band of SnO
x
, and reduces the interfacial gaps and the trap state density of the device, resulting in enhancement in average VOC from ∼1.2 V in the nonaged case to ∼1.4 V in the aged case. Furthermore, the device using an aged SnCl2 solution also exhibits a much better long-term stability than that made of the fresh solution. These achievements in dopant/additive-free CsPbI2Br solar cells can be useful for future research on CsPbI2Br and tandem solar cells.

リンク情報
DOI
https://doi.org/10.1021/jacs.0c02227
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/32357007
ID情報
  • DOI : 10.1021/jacs.0c02227
  • ORCIDのPut Code : 73908517
  • PubMed ID : 32357007

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