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Issue 41, 2012
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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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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 (Isc) from 5.59 to 5.81 mA cm−2 and the open-circuit voltage (Voc) 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.

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

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Article information


Submitted
06 Mar 2012
Accepted
04 Jul 2012
First published
06 Jul 2012

Phys. Chem. Chem. Phys., 2012,14, 14238-14242
Article type
Paper

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

J. Huang, H. Jia, L. Li, Z. Lu, W. Zhang, W. He, B. Jiang, A. Tang, Z. Tan, C. Zhan, Y. Li and J. Yao, Phys. Chem. Chem. Phys., 2012, 14, 14238
DOI: 10.1039/C2CP42050C

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