An A′–A–D–A–A′ type small molecule based on 2,7-carbazole for solution-processed organic solar cells with high open-circuit voltage†,10.1039/C3RA43958E

热搜：

Lactoyl-CoA 全氟丁基戊烷白叶藤碱全氟己基辛烷新白叶藤碱壳寡糖特色专题-生物多肽

An A′–A–D–A–A′ type small molecule based on 2,7-carbazole for solution-processed organic solar cells with high open-circuit voltage†

Hui Tong,Junqiao Ding,Zhiyuan Xie,Lixiang Wang

RSC Advances Pub Date : 09/25/2013 00:00:00 , DOI:10.1039/C3RA43958E

Abstract

A new A′–A–D–A–A′ type low band gap small molecule Cz-TBT-CAC8 with 2,7-carbazole as the center donor (D), benzothiadiazole as an electron acceptor (A) and alkyl cyanoacetate as another electron acceptor (A′) has been designed and synthesized as the donor material for the solution-processed bulk hetero-junction solar cells. This small molecule possesses a low lying HOMO level at −5.30 eV and an optical band gap of 1.73 eV. The solar cell based on Cz-TBT-CAC8/PC₆₁BM blend film spin-coated from chlorobenzene solution exhibits a PCE of 2.87% with a high V_oc of 1.05 V. After adding 0.2% DIO into the chlorobenzene solution as an additive, the PCE was further improved to 3.95% with a V_oc of 1.03 V, a J_sc of 7.32 mA cm⁻² and a FF of 0.52.