题目：

Narrow-Bandgap Single-Component Polymer Solar Cells with Approaching 9% Efficiency

作者：

Siying Li,^1,+ Xin Yuan,^1,+ Qilin Zhang,¹ Bin Li,¹ Yuxiang Li,² Jianguo Sun,¹ Yifeng Feng,¹ Xuning Zhang,³ Zang Wu,⁴ Huan Wei,⁵ Mei Wang,² Yuanyuan Hu,⁵ Yuan Zhang,³ Han Young Woo,⁴ Jianyu Yuan,^1,* and Wanli Ma^1,*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou 215123, P. R. China

²School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

³HEEGER Beijing Research & Development Center, School of Chemistry, Beihang University, Beijing 100191, China

⁴Department of Chemistry, Korea University, Seoul 02841, Republic of Korea

⁵Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry, of Education and Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics, Hunan University, Changsha 410082, China

摘要：

Two narrow-bandgap block conjugated polymers with a (D1–A1)–(D2–A2) backbone architecture, namely PBDB-T-b-PIDIC2T and PBDB-T-b-PTY6, are designed and synthesized for single-component organic solar cells (SCOSCs). Both polymers contain same donor polymer, PBDB-T, but different polymerized nonfullerene molecule acceptors. Compared to all previously reported materials for SCOSCs, PBDB-T-b-PIDIC2T and PBDB-T-b-PTY6 exhibit narrower bandgap for better light harvesting. When incorporated into SCOSCs, the short-circuit current density (J_sc) is significantly improved to over 15 mA cm⁻² , together with a record-high power conversion efficiency (PCE) of 8.64%. Moreover, these block copolymers exhibit low energy loss due to high charge transfer (CT) states (E_ct) plus small non-radiative loss (0.26 eV), and improved stability under both ambient condition and continuous 80 °C thermal stresses for over 1000 h. Determination of the charge carrier dynamics and film morphology in these SCOSCs reveals increased carrier recombination, relative to binary bulk-heterojunction devices, which is mainly due to reduced ordering of both donor and acceptor fragments. The close structural relationship between block polymers and their binary counterparts also provides an excellent framework to explore further molecular features that impact the photovoltaic performance and boost the state-of-the-art efficiency of SCOSCs.

影响因子：

27.398

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/adma.202101295