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arXiv · 1607.01607

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

Lingping Kong·Gang Liu·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 material. As regulated by Shockley-Queisser theory, a formidable materials science challenge for the next level improvement 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 70~100% 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 towards a further boost in their photovoltaic performance.

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Lingping Kong, Gang Liu, 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. 2016-08-07. Simultaneous band gap narrowing and carrier lifetime prolongation of organic-inorganic trihalide perovskites. https://doi.org/10.1073/pnas.1609030113

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