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  • Xiong, ShaobingEast China Normal Univ, Peoples R China (author)

Direct Observation on p- to n-Type Transformation of Perovskite Surface Region during Defect Passivation Driving High Photovoltaic Efficiency

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • CELL PRESS,2021
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:liu-174978
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174978URI
  • https://doi.org/10.1016/j.joule.2020.12.009DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Funding Agencies|National Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21875067, 51811530011, 11604099]; Fundamental Research Funds for the Central Universities, Shanghai Rising-Star [19QA1403100]; East China Normal University (ECNU) Multifunctional Platform for Innovation; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linko ping University (Faculty Grant SFO Mat LiU) [200900971]; National Key Research and Development Program of China [2017YFA0206600]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51773045, 21772030, 51922032]
  • Perovskite solar cells (PSCs) suffer from significant nonradiative recombination, limiting their power conversion efficiencies. Here, for the first time, we directly observe a complete transformation of perovskite MAPbI(3) surface region energetics from p- to n-type during defect passivation caused by natural additive capsaicin, attributed to the spontaneous formation of a p-n homojunction in perovskite active layer. We demonstrate that the p-n homojunction locates at similar to 100 nm below perovskite surface. The energetics transformation and defect passivation promote charge transport in bulk perovskite layer and at perovskite/PCBM interface, suppressing both defect-assisted recombination and interface carrier recombination. As a result, an efficiency of 21.88% and a fill factor of 83.81% with excellent device stability are achieved, both values are the highest records for polycrystalline MAPbI(3) based p-i-n PSCs reported to date. The proposed new concept of synergetic defect passivation and energetic modification via additive provides a huge potential for further improvement of PSC performance.

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  • Hou, ZhangyuEast China Normal Univ, Peoples R China (author)
  • Zou, ShijieSoochow Univ, Peoples R China (author)
  • Lu, XiaoshuangEast China Normal Univ, Peoples R China (author)
  • Yang, JianmingEast China Normal Univ, Peoples R China (author)
  • Hao, TianyuShanghai Jiao Tong Univ, Peoples R China (author)
  • Zhou, ZihaoEast China Normal Univ, Peoples R China (author)
  • Xu, JianhuaEast China Normal Univ, Peoples R China (author)
  • Zeng, YihanEast China Normal Univ, Peoples R China (author)
  • Xiao, WeiEast China Normal Univ, Peoples R China (author)
  • Dong, WeiEast China Normal Univ, Peoples R China (author)
  • Li, DanqinEast China Normal Univ, Peoples R China (author)
  • Wang, XiangEast China Normal Univ, Peoples R China (author)
  • Hu, ZhigaoEast China Normal Univ, Peoples R China (author)
  • Sun, LinEast China Normal Univ, Peoples R China (author)
  • Wu, YuningEast China Normal Univ, Peoples R China (author)
  • Liu, XianjieLinköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten(Swepub:liu)xiali21 (author)
  • Ding, LimingNatl Ctr Nanosci & Technol, Peoples R China (author)
  • Sun, ZhenrongEast China Normal Univ, Peoples R China (author)
  • Fahlman, MatsLinköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten(Swepub:liu)matfa21 (author)
  • Bao, QinyeEast China Normal Univ, Peoples R China; East China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China (author)
  • East China Normal Univ, Peoples R ChinaSoochow Univ, Peoples R China (creator_code:org_t)

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  • In:Joule: CELL PRESS5:2, s. 467-4802542-4351

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