Triplet Tellurophene‐Based Acceptors for Organic Solar Cells

• Published in: Angewandte Chemie International Edition Vol. 57; no. 4; pp. 1096 - 1102
• Main Authors: Yang, Lei, Gu, Wenxing, Lv, Lei, Chen, Yusheng, Yang, Yufei, Ye, Pan, Wu, Jianfei, Hong, Ling, Peng, Aidong, Huang, Hui
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 22.01.2018; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Acceptor materials; Chemical synthesis; Chemistry; Chemistry, Multidisciplinary; Energy conversion efficiency; Fullerenes; Heterojunctions; non-fullerene acceptors; organic solar cells; Photovoltaic cells; Physical Sciences; Science & Technology; Solar cells; tellurophene; triplet state; organic solar cells; RING-FUSION; ENERGY; OPEN-CIRCUIT VOLTAGE; PERYLENE DIIMIDES; CHARGE-TRANSFER STATES; non-fullerene acceptors; tellurophene; FIELD-EFFECT TRANSISTORS; triplet state; CONJUGATED POLYMERS; IRIDIUM COMPLEXES; EFFICIENCY; ELECTRON-ACCEPTORS
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201712011

Triplet materials have been employed to achieve high‐performing organic solar cells (OSCs) by extending the exciton lifetime and diffusion distances, while the triplet non‐fullerene acceptor materials have never been reported for bulk heterojunction OSCs. Herein, for the first time, three triplet molecular acceptors based on tellurophene with different degrees of ring fusing were designed and synthesized for OSCs. Significantly, these molecules have long exciton lifetime and diffusion lengths, leading to efficient power conversion efficiency (7.52 %), which is the highest value for tellurophene‐based OSCs. The influence of the extent of ring fusing on molecular geometry and OSCs performance was investigated to show the power conversion efficiencies (PCEs) continuously increased along with increasing the extent of ring fusing. Solar fusion: Three triplet molecular acceptors based on tellurophene with different degrees of ring fusing were prepared for organic solar cells (OSCs). These molecules have long exciton lifetimes and diffusion lengths, leading to increasing power conversion efficiencies (PCE) up to 7.52 %, which is the highest value for tellurophene‐based OSCs, as the degree of ring‐fusion increases.