Journal
AGGREGATE
Volume 3, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/agt2.58
Keywords
additive; all-polymer solar cell; energy loss; morphology; power conversion efficiency
Funding
- National Key Research and Development Program of China [2019YFA0705900]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council (Research Impact Fund) [R6021-18]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China [21927811, 91433202, 22005121]
- Swedish Research Council VR [2016-06146]
- Swedish Research Council
- Knut and Alice Wallenberg Foundation [2017.0186, 2016.0059]
- Hong Kong PhD Fellowship Scheme [PF17-03929]
- Natural Science Foundation of Top Talent of SZTU [20200205]
- China Postdoctoral Science Foundation [2020M673054]
- Postdoctoral Fund of Jinan University
- [C6023-19G]
- [16309218]
- [16310019]
- [16303917]
- Swedish Research Council [2016-06146] Funding Source: Swedish Research Council
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In this study, the morphology of the active layer in all-polymer solar cells was fine-tuned using solvent additive and polymer additive, resulting in an efficiency of 16.04%. Altering the shape of crystallites enhanced charge transport, reduced recombination, and suppressed energy loss, leading to improved device efficiency and stability.
Considering the robust and stable nature of the active layers, advancing the power conversion efficiency (PCE) has long been the priority for all-polymer solar cells (all-PSCs). Despite the recent surge of PCE, the photovoltaic parameters of the stateof-the-art all-PSC still lag those of the polymer:small molecule-based devices. To compete with the counterparts, judicious modulation of the morphology and thus the device electrical properties are needed. It is difficult to improve all the parameters concurrently for the all-PSCs with advanced efficiency, and one increase is typically accompanied by the drop of the other(s). In this work, with the aids of the solvent additive (1-chloronaphthalene) and the n-type polymer additive (N2200), we can fine-tune the morphology of the active layer and demonstrate a 16.04% efficient all-PSC based on the PM6:PY-IT active layer. The grazing incidence wideangle X-ray scattering measurements show that the shape of the crystallites can be altered, and the reshaped crystallites lead to enhanced and more balanced charge transport, reduced recombination, and suppressed energy loss, which lead to concurrently improved and device efficiency and stability.
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