Green Solvent Processable, Asymmetric Dopant-Free Hole Transport Layer Material for Efficient and Stable n-i-p Perovskite Solar Cells and Modules
Cheng, Qinrong1, Chen, Haiyang1, Chen, Weijie1（陈炜杰）, Ding, Junyuan1, Chen, Ziyuan1, Shen, Yunxiu1, Wu, Xiaoxiao1, Wu, Yeyong1, Li, Yaowen1,2,3,4（李耀文）, Li, Yongfang1,2
1Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials, Science Soochow University, Suzhou 215123 (China)
2Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123 (China)
3State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry,
Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China)
4Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Organic Solids
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
Angew. Chem. Ed. In., 2023, e202312231
Abstract：The use of dopant-free hole transport layers (HTLs) is critical in stabilizing n-i-p perovskite solar cells (pero-SCs). However, these HTL materials are often processed with toxic solvents, which is not ideal for industrial production. Upon substituting them with green solvents, a trade-off emerges between maintaining the high crystallinity of the HTL materials and ensuring high solubility in the new solvents. In this paper, we designed a novel, linear, organic small molecule, BDT-C8-3O, by introducing an asymmetric polar oligo(ethylene glycol) side chain. This method not only overcomes the solubility limitations in green solvents but also enables stacking the conjugated main chains in two patterns, which further enhances crystallinity and hole mobility. As a result, the n-i-p pero-SCs based on chlorobenzene- or green (natural compound) solvent 3-methylcyclohexanone-processed BDT-C8-3O HTL that without any dopant delivered world-recorded power conversion efficiencies of 24.11 % (certified of 23.82 %) and 23.53 %, respectively. The devices also demonstrated remarkable operational and high-temperature stabilities, maintaining over 84 % and 79.5 % of their initial efficiency for 2000 h, respectively. Encouragingly, dopant-free BDT-C8-3O HTL exhibits significant advantages in large-area fabrication, achieving state-of-the-art PCEs exceeding 20 % for 5x5 cm2 modules (active area: 15.64 cm2), even when processed using green solvents.
链接：//onlinelibrary.wiley.com/doi/10.1002/anie.202312231
