Adv. Mater. : Doping Manipulation of Donor/Acceptor by Perovskite Quantum Dots Enables >20.5% Organic Nonfullerene Solar Cells

Authors：

Bin Li¹, Du Li¹, Xinyu Zhao¹, Xiaoyang Shen¹, Hengzhe Ma¹, Dongren Zheng¹, Yiyun Li², Jiangkai Sun², Fan Liao¹, Hang Yin², Jianyu Yuan¹*

Institutions：

¹State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R.

²School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, P. R. China

Abstract：

Organic nonfullerene solar cells (ONSCs) have achieved remarkable progress, with power conversion efficiency (PCE) now surpassing 20%. To further improve the device performance, herein, we demonstrate a facile doping strategy using emerging perovskite quantum dots (QDs), which is anticipated to address critical issues like high exciton binding energy and limited charge transport. In a typical sequentially deposited planar heterojunction (PHJ) ONSCs, FAPbI₃ QDs were introduced into the donor polymer (D18) and acceptor molecule (L8BO) layers separately, which enables precise manipulation of the vertical doping and decouples the influence of QDs on donor/acceptor. Comprehensive characterizations reveal that the FAPbI₃ QD doping reduces energy disorder, enhances crystallinity, and promotes cascade energy alignment, thereby facilitating exciton dissociation and charge transport. Moreover, FAPbI₃ QDs act as energy mediators, prolonging carrier lifetime and suppressing non-radiative recombination. The optimal D18/L8BO device with simultaneous doping of donor/acceptor achieves a best PCE of 20.55% with a high fill factor exceeding 82%. We also demonstrate the application of QD doping strategy in varying representative donor/acceptor systems, paving a new avenue for minimizing energy loss and advancing the efficiency of ONSCs.

IF：

26.8

Link：

https://doi.org/10.1002/adma.73530