有机-无机三卤钙钛矿的同时带隙变窄和载流子寿命延长
Simultaneous band gap narrowing and carrier lifetime prolongation of organic-inorganic trihalide perovskites
摘要：
有机-无机杂化三卤化铅钙钛矿材料已成为最具吸引力的光伏材料。正如Shockley-Queisser理论所规定的那样，下一级改进的强大材料科学挑战需要进一步缩小太阳光谱中更广泛的吸收带隙，同时保持甚至协同延长载流子寿命，这是实现近带隙光电压的关键因素。在此，通过施加可控的静水压力，我们已经实现了前所未有的同时增强带隙窄化和载流子寿命延长（高达70~100%的增加）在温和的压力下约0.3 GPa。纯混合钙钛矿上的压力诱导调制而不引入任何不利的化学或热效应，清楚地表明了带边对光子-电子相互作用的重要性，并绘制了进一步提高其光伏性能的开拓性路线。
英文摘要：
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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