journal article·2017-02-22

1,3-Bis(thieno[3,4-b]thiophen-6-yl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione-Based Small-Molecule Donor for Efficient Solution-Processed Solar Cells

Zhongbo Zhang, Zichun Zhou, Qin Hu, Feng Liu, Thomas P. Russell, Xiaozhang Zhu

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Abstract

A small molecule TBTT-1 with 5-(2-ethylhexyl)-1,3-bis(2-(2-ethylhexyl)thieno[3,4- b ]thiophen-6-yl)-4 H -thieno[3,4- c ]pyrrole-4,6(5 H )-dione ( TBTT ) as the central moiety was designed and synthesized for solution-processed bulk-heterojunction solar cells. TBTT-1 exhibits a broad absorption with a low optical band gap of approximately 1.53 eV in the thin film. An optimized power conversion efficiency (PCE) of 7.47% with a high short-circuit current of 14.95 mA cm –2 was achieved with diphenyl ether (DPE) as additive, which is the highest PCE for TPD-based small-molecule solar cells. According to the detailed morphology investigations, we found that DPE processing helped to enhance π–π stacking and reduce the scales of phase separation, which led to improved exciton splitting and charge transport in BHJ thin film, and thus enhanced device performance.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiaotong University, Shanghai 200240, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · Office of Naval Research · National Natural Science Foundation of China · Chinese Academy of Sciences

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