The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications
KAUST DepartmentChemical Science Program
Physical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
KAUST Grant NumberOSR-2015-CRG4-2572
Embargo End Date2021-08-05
Permanent link to this recordhttp://hdl.handle.net/10754/664558
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AbstractOrganic 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.
CitationWadsworth, A., Hamid, Z., Kosco, J., Gasparini, N., & McCulloch, I. (2020). The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications. Advanced Materials, 2001763. doi:10.1002/adma.202001763
SponsorsThis article is part of the Advanced Materials Hall of Fame article series, which recognizes the excellent contributions of leading researchers to the field of materials science. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology Office of Sponsored Research (OSR) under Award Nos. OSR-2018-CARF/CCF-3079, OSR-2015-CRG4-2572, and OSR -4106 CPF2019. The authors acknowledge EC FP7 Project SC2 (610115), EC H2020 (643791), and EPSRC Projects EP/G037515/1, EP/M005143/1, and EP/L016702/1. Figure 11 was created by Heno Hwang, scientific illustrator at King Abdullah University of Science and Technology (KAUST).
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