Rational Strategy to Stabilize an Unstable High‐Efficiency Binary Nonfullerene Organic Solar Cells with a Third Component

Zhu, Youqin; Gadisa, Abay; Peng, Zhengxing; Ghasemi, Masoud; Ye, Long; Xu, Zheng; Zhao, Suling; Ade, Harald

doi:10.1002/aenm.201900376

Rational Strategy to Stabilize an Unstable High‐Efficiency Binary Nonfullerene Organic Solar Cells with a Third Component

Journal Article · Wed Apr 03 00:00:00 EDT 2019 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201900376· OSTI ID:1504795

Zhu, Youqin ^[1]; Gadisa, Abay ^[2]; Peng, Zhengxing ^[2]; Ghasemi, Masoud ^[2]; ^[2]; Xu, Zheng ^[3]; Zhao, Suling ^[3]; ^[2]

Department of Physics Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA, Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education Beijing 100044 China
Department of Physics Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education Beijing 100044 China

Abstract

Long device lifetime is still a missing key requirement in the commercialization of nonfullerene acceptor (NFA) organic solar cell technology. Understanding thermodynamic factors driving morphology degradation or stabilization is correspondingly lacking. In this report, thermodynamics is combined with morphology to elucidate the instability of highly efficient PTB7‐Th:IEICO‐4F binary solar cells and to rationally use PC ₇₁ BM in ternary solar cells to reduce the loss in the power conversion efficiency from ≈35% to <10% after storage for 90 days and at the same time improve performance. The hypomiscibility observed for IEICO‐4F in PTB7‐Th (below the percolation threshold) leads to overpurification of the mixed domains. By contrast, the hypermiscibility of PC ₇₁ BM in PTB7‐Th of 48 vol% is well above the percolation threshold. At the same time, PC ₇₁ BM is partly miscible in IEICO‐4F suppressing crystallization of IEICO‐4F. This work systematically illustrates the origin of the intrinsic degradation of PTB7‐Th:IEICO‐4F binary solar cells, demonstrates the structure–function relations among thermodynamics, morphology, and photovoltaic performance, and finally carries out a rational strategy to suppress the degradation: the third component needs to have a miscibility in the donor polymer at or above the percolation threshold, yet also needs to be partly miscible with the crystallizable acceptor.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1504795

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 20 Vol. 9; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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