期刊
ADVANCED MATERIALS
卷 34, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202107361
关键词
all-polymer solar cells; flexible conjugation-break spacers; mechanical robustness; polymer acceptors; stretchability
类别
资金
- Swedish Research Council [2016-06146, 2019-02345]
- Swedish Research Council Formas
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation [2017.0186, 2016.0059]
- National Research Foundation of Korea [NRF-2020M3H4A1A02084906, 2017M3A7B8065584, 2020R1A4A1018516]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-07]
- Sino-Danish Center for Education and Research
- Vinnova [2019-02345] Funding Source: Vinnova
- National Research Foundation of Korea [2020R1A4A1018516] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Swedish Research Council [2019-02345] Funding Source: Swedish Research Council
The introduction of a flexible conjugation-break spacer (FCBS) into polymer acceptors (P(A)s) enables the achievement of highly efficient and mechanically robust all-polymer solar cells (all-PSCs), improving both photovoltaic performance and mechanical stretchability.
High efficiency and mechanical robustness are both crucial for the practical applications of all-polymer solar cells (all-PSCs) in stretchable and wearable electronics. In this regard, a series of new polymer acceptors (P(A)s) is reported by incorporating a flexible conjugation-break spacer (FCBS) to achieve highly efficient and mechanically robust all-PSCs. Incorporation of FCBS affords the effective modulation of the crystallinity and pre-aggregation of the P(A)s, and achieves the optimal blend morphology with polymer donor (P-D), increasing both the photovoltaic and mechanical properties of all-PSCs. In particular, an all-PSC based on PYTS-0.3 P-A incorporated with 30% FCBS and PBDB-T P-D demonstrates a high power conversion efficiency (PCE) of 14.68% and excellent mechanical stretchability with a crack onset strain (COS) of 21.64% and toughness of 3.86 MJ m(-3), which is significantly superior to those of devices with the P-A without the FCBS (PYTS-0.0, PCE = 13.01%, and toughness = 2.70 MJ m(-3)). To date, this COS is the highest value reported for PSCs with PCEs of over 8% without any insulating additives. These results reveal that the introduction of FCBS into the conjugated backbone is a highly feasible strategy to simultaneously improve the PCE and stretchability of PSCs.
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