Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202101627
Keywords
electron-deficient cores; heat transfer; non-fullerene acceptors; organic photovoltaics; thermal stability
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Funding
- Research Grant council of Hong Kong [GRF12200119, C6023-19GF]
- National Key Research and Development Projects of China [2017YFA0206600]
- National Natural Science Foundation of China [21875286, 22005347]
- UGC/RGC fund [JLFS/P-102/18]
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The study examines the heat diffusion properties of Y-series non-fullerene acceptors with different frameworks and finds that extending the backbone rings results in higher thermal diffusivities. It demonstrates a correlation between the thermal transport properties in Y-series acceptors and their backbone geometry, molecule stacking, and thin-film crystallinity.
Efficient heat transfer is beneficial to heat dissipation and the thermal durability of organic solar cell (OSCs). In this regard, heat transfer properties of organic semiconductors within OSCs should play important roles, but their thermal properties are rarely explored. Here, heat diffusion properties of Y-series non-fullerene acceptors processing different DA'D framework, named BZ4F-5, BZ4F-6, and BZ4F-7 are probed; it is found that backbone rings extension from five- to six- and seven-membered-fused rings trigger longer phonon mean free path and higher thermal diffusivities (D) in their pristine solid films and bulk heterojunction blends. Particularly, the correlation between the thermal transport properties in Y-series acceptors and their backbone geometry, molecule stacking, and thin-film crystallinity is demonstrated. More importantly, both organic thin-film transistors and OSCs confirm that thermal durability of organic semiconductor devices correlated with the thermal properties of their active layer. Although BZ5F-6 and BZ4F-7 based devices possess similar device performance at room temperature, superior heat dissipation in BZ4F-7 molecule endows it with enhanced device lifetime. These results contribute to critical design criteria for future molecular optimization in photovoltaic and optoelectronic devices.
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