Simultaneous Band-Gap Narrowing and Carrier-Lifetime Prolongation of Organic-Inorganic Trihalide Perovskites

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

Research output: Contribution to journalArticlepeer-review

266 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 languageAmerican English
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 - 9 Aug 2016

NREL Publication Number

  • NREL/JA-5900-66664

Keywords

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

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