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- Title
Polymer Fiber Rigid Network with High Glass Transition Temperature Reinforces Stability of Organic Photovoltaics.
- Authors
Zhou, Qiao; Yan, Cenqi; Li, Hongxiang; Zhu, Zhendong; Gao, Yujie; Xiong, Jie; Tang, Hua; Zhu, Can; Yu, Hailin; Lopez, Sandra P. Gonzalez; Wang, Jiayu; Qin, Meng; Li, Jianshu; Luo, Longbo; Liu, Xiangyang; Qin, Jiaqiang; Lu, Shirong; Meng, Lei; Laquai, Frédéric; Li, Yongfang
- Abstract
Highlights : A unique approach is proposed: constructing a polymer fiber rigid network with high glass transition temperature. Frozen bulk heterojunction morphology impeded deterioration of exciton quenching, charge transport, and charge extraction properties during thermal aging. The strategy is universal and can be further optimized for enhanced thermal stability and improved mechanical resilience. Organic photovoltaics (OPVs) need to overcome limitations such as insufficient thermal stability to be commercialized. The reported approaches to improve stability either rely on the development of new materials or on tailoring the donor/acceptor morphology, however, exhibiting limited applicability. Therefore, it is timely to develop an easy method to enhance thermal stability without having to develop new donor/acceptor materials or donor–acceptor compatibilizers, or by introducing another third component. Herein, a unique approach is presented, based on constructing a polymer fiber rigid network with a high glass transition temperature (Tg) to impede the movement of acceptor and donor molecules, to immobilize the active layer morphology, and thereby to improve thermal stability. A high-Tg one-dimensional aramid nanofiber (ANF) is utilized for network construction. Inverted OPVs with ANF network yield superior thermal stability compared to the ANF-free counterpart. The ANF network-incorporated active layer demonstrates significantly more stable morphology than the ANF-free counterpart, thereby leaving fundamental processes such as charge separation, transport, and collection, determining the device efficiency, largely unaltered. This strategy is also successfully applied to other photovoltaic systems. The strategy of incorporating a polymer fiber rigid network with high Tg offers a distinct perspective addressing the challenge of thermal instability with simplicity and universality.
- Subjects
PHOTOVOLTAIC power generation; GLASS transition temperature; PHOTOVOLTAIC power systems; THERMAL instability; THERMAL stability; SUPERCONDUCTING transition temperature; POLYMERS; CONJUGATED polymers
- Publication
Nano-Micro Letters, 2024, Vol 16, Issue 1, p1
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-024-01442-0