Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic-inorganic trihalide perovskites

Lingping Kong, Gang Liua*, Jue Gong, Qingyang Hu, Richard D. Schaller, Przemyslaw Dera, Dongzhou Zhang, Zhenxian Liu, Wenge Yang, Kai Zhu, Yuzhao Tang, Chuanyi Wang, Su Huai Wei, Tao Xu, Ho Kwang Mao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

186 Scopus citations

Abstract

The organic-inorganic hybrid lead trihalide perovskites have been emerging as the most attractive photovoltaic materials. As regulated by Shockley-Queisser theory, a formidable materials science challenge for improvement to the next level requires further band-gap narrowing for broader absorption in solar spectrum, while retaining or even synergistically prolonging the carrier lifetime, a critical factor responsible for attaining the near-band-gap photovoltage. Herein, by applying controllable hydrostatic pressure, we have achieved unprecedented simultaneous enhancement in both band-gap narrowing and carrier-lifetime prolongation (up to 70% to ?100% increase) under mild pressures at ?0.3 GPa. The pressure-induced modulation on pure hybrid perovskites without introducing any adverse chemical or thermal effect clearly demonstrates the importance of band edges on the photon-electron interaction and maps a pioneering route toward a further increase in their photovoltaic performance.

Original languageEnglish (US)
Pages (from-to)8910-8915
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Issue number32
DOIs
StatePublished - Aug 9 2016

Keywords

  • Band gap
  • Carrier lifetime
  • High pressure
  • Perovskite|solar cell

ASJC Scopus subject areas

  • General

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