期刊
ADVANCED MATERIALS
卷 32, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001763
关键词
bulk heterojunctions; nonfullerene acceptors; organic photodetectors; organic photovoltaics; photocatalysis
类别
资金
- King Abdullah University of Science and Technology Office of Sponsored Research (OSR) [OSR2018-CARF/CCF-3079, OSR-2015-CRG4-2572, OSR - 4106 CPF2019]
- EC FP7 Project SC2 [610115]
- EPSRC [EP/G037515/1, EP/M005143/1, EP/L016702/1]
- EC H2020 [643791]
- EPSRC [EP/M005143/1] Funding Source: UKRI
Organic semiconductors require an energetic offset in order to photogenerate free charge carriers efficiently, owing to their inability to effectively screen charges. This is vitally important in order to achieve high power conversion efficiencies in organic solar cells. Early heterojunction-based solar cells were limited to relatively modest efficiencies (<4%) owing to limitations such as poor exciton dissociation, limited photon harvesting, and high recombination losses. The development of the bulk heterojunction (BHJ) has significantly overcome these issues, resulting in dramatic improvements in organic photovoltaic performance, now exceeding 18% power conversion efficiencies. Here, the design and engineering strategies used to develop the optimal bulk heterojunction for solar-cell, photodetector, and photocatalytic applications are discussed. Additionally, the thermodynamic driving forces in the creation and stability of the bulk heterojunction are presented, along with underlying photophysics in these blends. Finally, new opportunities to apply the knowledge accrued from BHJ solar cells to generate free charges for use in promising new applications are discussed.
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