厦门大学吴炳辉团队开发出钙钛矿量子点作为无掺杂剂有机空穴传输层钙钛矿太阳能电池中的多功能中间层。相关研究成果发表在2021年4月9日出版的《美国化学会杂志》。

具有有机空穴传输层的钙钛矿型太阳能电池（PSCs）由于其方便的溶液处理而得到广泛的研究，但如何在保持PSCs稳定性的同时提高商用有机空穴传输材料的空穴迁移率仍然是一个很大的挑战。

该研究中，研究人员证明了引入钙钛矿量子点（QDs）作为钙钛矿层和无掺杂的o-HTLs（P3HT，PTAA，Spiro-OMeTAD）之间的中间层可以显著提高PSCs的性能。验证了量子点在提高PSCs效率和稳定性方面的普遍作用，超过了锂掺杂的作用。

在深入研究了其机理后，量子点层具有以下多种功能：（1）钝化钙钛矿表面，减少陷阱态总量；（2）通过形成级联能级，促进从钙钛矿到无掺杂o-HTL的空穴提取；（3） 通过调节聚合物/分子的取向来提高无掺杂邻位HTL的空穴迁移率。此外，QD中间层的加入大大提高了无掺杂o-HTLs基PSCs的热/湿/光稳定性。

最后，研究人员用无掺杂的o-HTLs制作了大面积太阳能组件，证明了QD夹层的可靠性，显示出巨大的商业应用潜力。

附：英文原文

Title: Perovskite Quantum Dots as Multifunctional Interlayers in Perovskite Solar Cells with Dopant-Free Organic Hole Transporting Layers

Author: Fangwen Cheng, Ruiqin He, Siqing Nie, Chongjian Zhang, Jun Yin, Jing Li, Nanfeng Zheng, Binghui Wu

Issue&Volume: April 9, 2021

Abstract: Perovskite solar cells (PSCs) with organic hole transporting layers (o-HTLs) have been widely studied due to their convenient solution processing, but it remains a big challenge to improve the hole mobilities of commercially available organic hole transporting materials without ion doping while maintaining the stability of PSCs. In this work, we demonstrated that the introduction of perovskite quantum dots (QDs) as interlayers between perovskite layers and dopant-free o-HTLs (P3HT, PTAA, Spiro-OMeTAD) resulted in a significantly enhanced performance of PSCs. The universal role of QDs in improving the efficiency and stability of PSCs was validated, exceeding that of lithium doping. After a deep examination of the mechanism, QD interlayers provided the multifunctional roles as follows: (1) passivating the perovskite surface to reduce the overall amount of trap states; (2) promoting hole extraction from perovskite to dopant-free o-HTLs by forming cascade energy levels; (3) improving hole mobilities of dopant-free o-HTLs by regulating their polymer/molecule orientation. What is more, the thermal/moisture/light stabilities of dopant-free o-HTLs-based PSCs were greatly improved with QD interlayers. Finally, we demonstrated the reliability of the QD interlayers by fabricating large-area solar modules with dopant-free o-HTLs, showing great potential in commercial usage.

DOI: 10.1021/jacs.1c00852

Source: https://pubs.acs.org/doi/10.1021/jacs.1c00852