国霞副教授、张茂杰教授与李永舫院士合作在Macromol. Rapid Commun. 上发表研究论文

Kun Wang¹, Xia Guo*¹（国霞）, Bing Guo¹, Wanbin Li¹, Maojie Zhang*¹（张茂杰）, Yongfang Li*^{1 2}（李永舫）

¹Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China

²Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China

Macromol. Rapid Commun. 2016, 37, 1066−1073

A new broad bandgap and 2D-conjugated D-A copolymer, PBDTBTz-T, based on bithienyl-benzodithiophene donor unit and bithiazole (BTz) acceptor unit, is designed and synthesized for the application as donor material in polymer solar cells (PSCs). The polymer possesses highly coplanar and crystalline structure with a higher hole mobility and lower HOMO energy level which is beneficial to achieve higher open circuit voltage (V_oc) of the PSCs with the polymer as donor. The PSCs based on PBDTBTz-T:PC₇₁BM blend film with a lower PC₇₁BM content of 40% demonstrate a power conversion efficiency (PCE) of 6.09% with a relatively higher V_oc of 0.92 V. These results indicate that the lower HOMO energy level of the BTz-based D–A copolymer is beneficial to a high V_oc of the PSCs. The polymer, with highly coplanar and crystalline structure, can effectively reduce the content of fullerene acceptor in the active layer and can enhance the absorption and PCE of the PSCs.

链接：http://onlinelibrary.wiley.com/doi/10.1002/marc.201600115/abstract