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Although organic photovoltaic (OPV) cells have many advantages, their performance still lags far behind that of other photovoltaic platforms. A fundamental reason for their low performance is the low charge mobility of organic materials, leading to a limit on the active-layer thickness and efficient light absorption. In this work, guided by a semi-empirical model analysis and using the tandem cell strategy to overcome such issues, and taking advantage of the high diversity and easily tunable band structure of organic materials, a record and certified 17.29% power conversion efficiency for a two-terminal monolithic solution-processed tandem OPV is achieved.

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His research focuses on developing high-efficiency organic solar cells and morphology manipulation, characterization in organic/perovskite semiconductor films.

Tuning the molecular ordering of COi8DFIC from flat-on and edge-on lamellae to Hand J-type p-p stacking results in broadened absorption spectrum and fine phase separation with the electron donor PTB7-Th, which promotes efficient exciton dissociation at the donor/acceptor interface together with enhanced and balanced carrier mobility, and leads to an unprecedented PCE of 13.8% of singlejunction, binary PTB7-Th:COi8DFIC solar cell.

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Rational material design and additive selection boost the longevity of high-efficiency non-fullerene solar cells against photo-oxidation.

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