在 MASnI3 薄膜中掺入 SnF2 后观察到的热声子瓶颈及其在增加光载流子扩散长度方面可能发挥的作用

F. Xu, Haoming Wei, Bingqiang Cao
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引用次数: 0

摘要

据报道,SnF2 是提高无铅锡基过氧化物太阳能电池效率的有效添加剂,但其机理尚不清楚,需要进一步研究。霍尔测量证实,在 MASnI3 中加入 SnF2 后,SnF2 会将本征载流子密度从 1018 cm-3 降低到 1012 cm-3,并产生更长的载流子扩散长度。飞秒瞬态吸收光谱显示,SnF2 的掺杂增强了 MASnI3 的热声子瓶颈效应。热载流子的缓慢冷却过程有助于减少非辐射重组,延长荧光寿命,从而提高载流子的利用率。最后,无铅低带隙透辉石 MASnI3 被用作太阳能电池的光吸收层,在锡基透辉石太阳能电池中实现了高光电流和高电压。最终的功率转换效率为 10.2%,而控制单元的功率转换效率为 6.69%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A hot phonon bottleneck observed upon incorporation of SnF2 to MASnI3 films and its possible role in increasing photocarrier diffusion length
While SnF2 is reported as an effective additive for improving the efficiency of lead-free tin-based perovskite solar cells, the mechanism is still unclear and requires further studies. Upon incorporating SnF2 into MASnI3, SnF2 reduces the intrinsic carrier density from 1018 to 1012 cm–3 and produces a longer carrier diffusion length as confirmed by the Hall measurements. The femtosecond transient absorption spectroscopy shows that SnF2 doping enhances the hot-phonon bottleneck effect of MASnI3. The slow cooling process of hot carriers may help to reduce non-radiative recombination, increase the fluorescence lifetime, and, therefore, improve the utilization rate of carriers. Finally, lead-free low bandgap perovskite MASnI3 is utilized as a light absorbing layer in solar cells, achieving high optical current and high voltage in tin-based perovskite solar cells. The final power conversion efficiency is 10.2%, while the power conversion efficiency for the control unit is 6.69%.
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