journal article·2019-05-22

Comprehensive Investigation and Analysis of Bulk-Heterojunction Microstructure of High-Performance PCE11:PCBM Solar Cells

Chaohong Zhang, Thomas Heumueller, Wolfgang Gruber, Osbel Almora, Xiaoyan Du, Lei Ying, Junwu Chen, Tobias Unruh, Yong Cao, Ning Li, Christoph J. Brabec

ACS Applied Materials & Interfaces· Volume 11· Issue 20
Publisher page

Abstract

Worldwide research efforts have been devoted to organic photovoltaics in the hope of a large-scale commercial application in the near future. To meet the industrial production requirements, organic photovoltaics that can reach power conversion efficiency (PCE) of over 10% along with promising operational device stability are of utmost interest. In the study, we take PCE11:PCBM as a model system, which can achieve over 11% PCE when processed from nonhalogen solvents, to deeply investigate the morphology-performance-stability correlation. We demonstrate that four batches of PCE11 with varying crystalline properties can achieve similar high performance in combination with PCBM. Careful device optimization is necessary in each case to properly address the requirements for the quite distinct microstructures. The bulk-heterojunction (BHJ) microstructure is comprehensively investigated as a function of the macromolecular weight and crystallinity. It is demonstrated that small differences in morphology significantly affect the kinetics and thermodynamic equilibrium of the BHJ microstructure as well as the photostability and thermal stability of the PCE11:PCBM solar cells.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Thin-Film Transistor Technologies

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

Affiliations

SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, No. 1088, Xueyuan Road, 518055 Shenzhen, Guangdong, P. R. China

Institute Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander University Erlangen-Nürnberg, Martensstrasse 7, 91058 Erlangen, Germany

Institute for Crystallography and Structure Physics, Friedrich-Alexander University Erlangen-Nürnberg, Staudtstrasse 3, 91058 Erlangen, Germany

Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, 381 Wushan Road, 510640 Guangzhou, P. R. China

National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, No. 100 Science Avenue, 450002 Zhengzhou, P. R. China

Helmholtz-Institute Erlangen-Nürenberg (HIERN), Immerwahrstr. 2, 91058 Erlangen, Germany

Funding

Bundesministerium f?r Bildung und Forschung · Ministry of Science and Technology of the People's Republic of China · Deutsche Forschungsgemeinschaft · Bayerisches Staatsministerium f?r Wissenschaft, Forschung und Kunst · Freistaat Bayern

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