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

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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
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
Publication statusPublished - Aug 9 2016

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Keywords

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

ASJC Scopus subject areas

  • General

Cite this

Kong, L., Liua, G., Gong, J., Hu, Q., Schaller, R. D., Dera, P., Zhang, D., Liu, Z., Yang, W., Zhu, K., Tang, Y., Wang, C., Wei, S. H., Xu, T., & Mao, H. K. (2016). Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic-inorganic trihalide perovskites. Proceedings of the National Academy of Sciences of the United States of America, 113(32), 8910-8915. https://doi.org/10.1073/pnas.1609030113