Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Multi-component organic solar cells (OSCs) comprising more than two donor and acceptor materials have attracted significant research attention, as they can offer broader and better absorption, hence increasing solar cell performance. However, the morphology of multi-component OSCs is exceptionally complicated and challenging to control. Here, we develop a highly efficient (near 17.7%) quaternary OSC (q-OSC) using two polymer donors (namely PM6 and PTQ10) along with a fullerene (PC71BM) and a non-fullerene acceptor (N3). Our quaternary system demonstrates a new type of “rivers and streams” functional hierarchical (multi-length scale) morphology, where small domains of PTQ10 and PC71BM act as separators that spatially separate PM6 and N3, which effectively suppressed charge recombination, enhanced hole transport, and balanced charge transportation. These improvements in the quaternary system contribute to the increased internal quantum efficiency (IQE) and, thus, lead to an excellent JSC and device performance, which surpass their respective binary and ternary OSCs.
Hong Kong Research Grants Council (HK-RGC grants: R6021-18, 16305915, 16322416, 606012, and 16303917).
The Shenzhen Technology and Innovation Commission (project number JCYJ20170413173814007 and JCYJ20170818113905024).
Hong Kong Innovation and Technology Commission for the support through projects ITC-CNERC14SC01 and ITS/471/18).
HK-RGC grant: AoE/P-02/12. P.C.Y.C. acknowledges HK-RGC grants: 16306117, 16304218, and 16306319.
Nanosystem Fabrication Facility (NFF) and Material Characterization & Preparation Facility (MCPF) of HKUST for the characterization and analysis of our materials.
U.S. Office of Naval Research (ONR) under award no. N000141712204 and N000142012155.
X-ray data were acquired at beamlines 7.3.3 and 11.0.1.2 at the Advanced Light Source, LBNL, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231.
National Natural Science Foundation of China (51873140 and 51820105003) and the Collaborative Innovation Centre of Suzhou Nano Science and Technology.
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