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

  • [设施]:上海设施
  • [期刊/会议名称]:PNAS
  • [摘要]: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.
  • [发表日期]:2016
  • [第一作者]:Lingping Kong
  • [第一作者单位]:Center for High Pressure Science and Technology Advanced Research
  • [通讯作者]:Ho-kwang Mao
  • [通讯作者单位]:Center for High Pressure Science and Technology Advanced Research
  • [论文类型]:null
  • [期刊分类]:
  • [学科分类]:null
  • [影响因子]:9.423
  • [关键词]:perovskite, solar cell, high pressure, band gap, carrier lifetime
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  • [简介]:研究小组采用压力这一清洁、有效的手段,实现了对材料的晶体结构和电子结构的调控。研究证实:在较低压力下小,带隙降低数十个毫电子伏特且载流子寿命延长了一倍,从而实现了同步性的优化。这为揭示有机-无机材料的高功能性的机制提供了坚实的实验基础,也为下一步新材料的开发提供了思路。