Toluene Processed All‐Polymer Solar Cells with 18% Efficiency and Enhanced Stability Enabled by Solid Additive: Comparison Between Sequential‐Processing and Blend‐Casting

• Published in: Energy & environmental materials (Hoboken, N.J.) Vol. 7; no. 4
• Main Authors: Zhang, Guoping, Zhao, Chaoyue, Zhu, Liangxiang, Wang, Lihong, Xiong, Wenzhao, Hu, Huawei, Bai, Qing, Wang, Yaping, Xie, Chen, You, Peng, Yan, He, Wu, Dan, Yang, Tao, Qiu, Mingxia, Li, Shunpu, Zhang, Guangye
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.07.2024
• Subjects: all‐polymers solar cells; Aromatic hydrocarbons; Chlorine compounds; Chloroform; Efficiency; Energy levels; Energy loss; Molecular orbitals; Photovoltaic cells; Polymers; sequential processing; Solar cells; solid additive; Solvents; Toluene
• ISSN: 2575-0356; 2575-0356
• DOI: 10.1002/eem2.12683

The emergence of polymerized small molecule acceptors (PSMAs) has significantly improved the performance of all‐polymer solar cells (all‐PSCs). However, the pace of device engineering lacks behind that of materials development, so that a majority of the PSMAs have not fulfilled their potentials. Furthermore, most high‐performance all‐PSCs rely on the use of chloroform as the processing solvent. For instance, the recent high‐performance PSMA, named PJ1‐γ, with high LUMO, and HOMO levels, could only achieve a PCE of 16.1% with a high‐energy‐level donor (JD40) using chloroform. Herein, we present a methodology combining sequential processing (SqP) with the addition of 0.5%wt PC71BM as a solid additive (SA) to achieve an impressive efficiency of 18.0% for all‐PSCs processed from toluene, an aromatic hydrocarbon solvent. Compared to the conventional blend‐casting (BC) method whose best efficiency (16.7%) could only be achieved using chloroform, the SqP method significantly boosted the device efficiency using toluene as the processing solvent. In addition, the donor we employ is the classic PM6 that has deeper energy levels than JD40, which provides low energy loss for the device. We compare the results with another PSMA (PYF‐T‐o) with the same method. Finally, an improved photostability of the SqP devices with the incorporation of SA is demonstrated. The lack of device engineering limits the performance of many promising polymer acceptors. We employ a combined effort of the sequential processing technique and the incorporation of solid additive to significantly promote the all‐polymer solar cell device (18%) with the polymerized small molecule acceptor (PJ1r). The device is made from toluene instead of the commonly used chloroform. An enhanced photostability is observed in the 18% device.