Resolving Ternary Morphology for High-Performance Thickness-Insensitive Organic Solar Cells

High-performance organic solar cells (OSCs) suffer from low active layer thickness tolerance, which is incompatible with large-scale printing technology originally envisioned for low-cost module manufacturing. Herein, by incorporating a large amount of small-molecule donor BTR-Cl into the prototypical PM6/Y6 blend film, we fabricated efficient ternary devices with a photoconversion efficiency of 17.7% at an active layer thickness of 300 nm, among the best-performing thick-film devices reported so far. To elucidate its morphological origin, we deuterated both Y6 and BTR-Cl to resolve their morphology in ternary blend films separately via grazing-incidence small-angle neutron scattering (GISANS). We observed enhanced short-range aggregation of both Y6 and BTR-Cl within the intermixed domains of the ternary blend film induced by the accelerated molecular assembly process. Those aggregates act as effective bridges between crystalline domains to improve connectivity in both donor and acceptor phases, resulting in enhanced carrier mobility, suppressed space charge accumulation, and consequently significantly improved thickness tolerance in ternary devices. Our work demonstrates the effectiveness of combined targeted deuteration and GISANS to resolve the complicated structures within multicomponent OSC active layers and highlights the critical role of amorphous nanomorphology in carrier transport connectivity and, consequently, the thickness tolerance of high-performance OSCs.

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Publication Details

Journal
ACS Applied Materials & Interfaces
Published
2025-11-28
DOI
https://doi.org/10.1021/acsami.5c17321
Citations
1
Primary Topic
Organic Electronics and Photovoltaics
Type
article
Field-Weighted Citation Impact
0.73
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article

Resolving Ternary Morphology for High-Performance Thickness-Insensitive Organic Solar Cells

U‐Ser Jeng, Yúang Fu, Zhaozhao Bi, Pok Fung Chan et al.
1 citations
ACS Applied Materials & Interfaces
Organic Electronics and Photovoltaics
0.73
article

Resolving Ternary Morphology for High-Performance Thickness-Insensitive Organic Solar Cells

U‐Ser Jeng, Yúang Fu, Zhaozhao Bi, Pok Fung Chan, Guangye Zhang, Xiankai Chen, Yuhao Li, Guilong Cai, Yubin Ke, Xinhui Lu, Lei Huang, Chun‐Jen Su, Heng Liu, Lu Chen, Fei Huang, Zhaoyang Nie, Luhang Xu, Shengtian Zhu, Wei Ma
article en
1 citations

Abstract

High-performance organic solar cells (OSCs) suffer from low active layer thickness tolerance, which is incompatible with large-scale printing technology originally envisioned for low-cost module manufacturing. Herein, by incorporating a large amount of small-molecule donor BTR-Cl into the prototypical PM6/Y6 blend film, we fabricated efficient ternary devices with a photoconversion efficiency of 17.7% at an active layer thickness of 300 nm, among the best-performing thick-film devices reported so far. To elucidate its morphological origin, we deuterated both Y6 and BTR-Cl to resolve their morphology in ternary blend films separately via grazing-incidence small-angle neutron scattering (GISANS). We observed enhanced short-range aggregation of both Y6 and BTR-Cl within the intermixed domains of the ternary blend film induced by the accelerated molecular assembly process. Those aggregates act as effective bridges between crystalline domains to improve connectivity in both donor and acceptor phases, resulting in enhanced carrier mobility, suppressed space charge accumulation, and consequently significantly improved thickness tolerance in ternary devices. Our work demonstrates the effectiveness of combined targeted deuteration and GISANS to resolve the complicated structures within multicomponent OSC active layers and highlights the critical role of amorphous nanomorphology in carrier transport connectivity and, consequently, the thickness tolerance of high-performance OSCs.

ACS Applied Materials & InterfacesVol. 17(49)
Chinese University of Hong Kong (HK), Chinese Academy of Sciences (CN), National Tsing Hua University (TW), Soochow University (CN), National Synchrotron Radiation Research Center (TW), China Spallation Neutron Source (CN), Tsinghua–Berkeley Shenzhen Institute (CN), Institute of Materials Research of the Slovak Academy of Sciences (SK), Institute of Process Engineering (CN), Institute of High Energy Physics (CN), Advanced Materials and Devices (United States) (US), Shenzhen Technology University (CN), Nano Carbon (Poland) (PL), State Key Laboratory of Luminescent Materials and Devices, Xi'an Jiaotong University (CN), South China University of Technology (CN), Tsinghua University (CN)
Openalex Percentile: Top 21%
Organic Electronics and Photovoltaics
0.73
DOIOpen Access PDFOpenAlex
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