Fine-tuning device performances of small molecule solar cells via the more polarized DPP-attached donor units

Jianhua Huang; Hui Jia; Liangjie Li; Zhenhuan Lu; Wenqing Zhang; Weiwei He; Bo Jiang; Ailing Tang; Zhan'ao Tan; Chuanlang Zhan; Yongfang Li; Jiannian Yao

doi:10.1039/C2CP42050C

Fine-tuning device performances of small molecule solar cells via the more polarized DPP-attached donor units†

Jianhua Huang,‡^a Hui Jia,‡^a Liangjie Li,‡^bc Zhenhuan Lu,^a Wenqing Zhang,^bc Weiwei He,^a Bo Jiang,^a Ailing Tang,^a Zhan'ao Tan,*^bc Chuanlang Zhan,*^a Yongfang Li*^b and Jiannian Yao*^a

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* Corresponding authors

^a Beijing National Laboratory of Molecular Science, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
E-mail: clzhan@iccas.ac.cn, jnyao@iccas.ac.cn
Fax: (+86)-10-82616517

^b CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
E-mail: liyf@iccas.ac.cn

^c State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing, China
E-mail: tanzhanao@ncepu.edu.cn

Abstract

Three solution-processable small molecules of DPPT, DPPSe and DPPTT were synthesized by Stille coupling through attaching donor units of thiophene (T), selenophene (Se) and thieno[3,2-b]thiophene (TT) to the diketopyrrolopyrrole (DPP) core, respectively. Replacement of the T donors with the more polarized Se units results in a balance between the a and b direction packing and an obvious increase of the power conversion efficiency (PCE) from 1.90% to 2.33% with the increase of the short-circuit current (I_sc) from 5.59 to 5.81 mA cm⁻² and the open-circuit voltage (V_oc) from 0.78 V to 0.86 under the small molecule/acceptor ratio of 3 : 1. However, introduction of the conjugation-enlarged TT groups (versus the T units) leads to a decrease of the PCE, down to 1.70%, with a significant decrease of the fill factor (FF) (38% versus 44%), due to its poor film-forming characteristics.

This article is part of the themed collection: Organic electronics - new physical chemistry insight

Physical Chemistry Chemical Physics

Fine-tuning device performances of small molecule solar cells via the more polarized DPP-attached donor units†

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Fine-tuning device performances of small molecule solar cells via the more polarized DPP-attached donor units

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