题目：

Narrow Bandgap Conjugated Polymers Based on a High-Mobility Polymer Template for Visibly Transparent Photovoltaic Devices

作者：

Jianyu Yuan,*¹ Michael Ford,² Guanqun Ding,¹ Huilong Dong,¹ Ming Wang,² Lu Han,¹ Youyong Li,¹ Guillermo C.Bazan*² and Wanli Ma*¹

单位：

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

2. Center of Polymers and Organic Solids, Departments of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106 , USA

摘要：

In this contribution, starting from a high mobility polymer P2 with regioregular D-A-D-A structure, we set out to further optimize the optical bandgap and energy levels for photovoltaic application. By introducing different donor segments to comprise a modified D’-A-D-A backbone, we successfully synthesized three polymers named as PBT, PFT and PPT. Our results demonstrate that the rotation barrier between the D’ and A or D and A significantly increases after using asymmetric A unit PT, compared to either asymmetric FBT unit or the original BT unit. So, PPT has a more planar backbone conformation, stronger intermolecular contacts and higher degree of structural order than PBT and PFT, and also possesses deeper HOMO level. When blended with PC61BM, a fullerene acceptor, the PPT-based device showed a power conversion efficiency (PCE) of 7.3 %, which is higher than that of PFT (6.7%) and PBT-based (6.2%) device; when blended with ITIC, a non-fullerene acceptor, the PPT-based device showed a PCE of 5.4 %, which is also higher than that of the PFT (4.4%) and PBT-based (4.7%) device. Most importantly, we discover these blends consisting of either PC61BM or ITIC as the electron acceptor exhibit an average transmission of ~60% over the 400 to 600 nm range and a maximum transmission of ~70% at ~500 nm, which provides opportunities and possibilities of achieving high performance and stable visibly transparent PVs in the future.

影响因子：

8.262

分区：

一区

链接情况：

http://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta07201a#!divAbstract

（责任编辑：向丹婷 联系方式：dtxiang@suda.edu.cn）