Taurine modified hole transport layers for efficient low-bandgap perovskite solar cells

Huayang Wang, Tianshu Ma, Yuhui Liu, Changlei Wang
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Abstract

All-perovskite tandem solar cells (TSCs) show an effective way to overcome the efficiency limit of single-junction perovskite solar cells (PSCs). Low-bandgap mixed tin-lead perovskite bottom subcell is a critical component in all perovskite TSCs, which are currently limited by the relatively low efficiency and poor stability of the bottom subcells. Here in this work, we use multifunctional taurine material to dope and modify the PEDOT:PSS hole transport layer (HTL) for better optical transmittance and charge transporting properties, enabling efficient low-bandgap PSCs with highly improved open circuit voltages and short circuit current densities. Taurine has a suitable refractive index to reduce light reflection loss when introduced at the interface of PEDOT:PSS/perovskite film. Moreover, taurine improves the energy level alignments and facilitates charge transfer dynamics in the low-bandgap PSCs when doped into the PEDOT:PSS HTL. Finally, the synergistic effects of the interface modification and bulk doping of PEDOT:PSS with taurine leads to significantly enhanced efficiencies of over 22% and 26% for low-bandgap PSCs and all-perovskite TSCs, respectively.
高效低带隙钙钛矿太阳能电池中牛磺酸修饰的空穴传输层
全钙钛矿串联太阳能电池(TSCs)是克服单结钙钛矿太阳能电池(PSCs)效率限制的有效途径。低带隙混合锡铅钙钛矿底亚电池是所有钙钛矿TSCs的关键组成部分,目前底亚电池效率相对较低,稳定性较差,限制了钙钛矿TSCs的发展。在这项工作中,我们使用多功能牛磺酸材料对PEDOT:PSS空穴传输层(HTL)进行掺杂和修饰,以获得更好的光学透过率和电荷传输性能,从而实现高效的低带隙PSCs,并大大提高了开路电压和短路电流密度。牛磺酸具有合适的折射率,在PEDOT:PSS/钙钛矿膜界面处引入牛磺酸可以减少光的反射损失。此外,当牛磺酸掺杂到PEDOT:PSS HTL中时,可以改善低带隙PSCs中的能级排列并促进电荷转移动力学。最后,牛磺酸修饰和大量掺杂PEDOT:PSS的协同效应导致低带隙PSCs和全钙钛矿TSCs的效率分别显著提高22%和26%以上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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