Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.015
Publication date: 7th February 2022
In the past two decades the power conversion efficiency of organic solar cells has increased significantly and is now closing the gap to crystalline silicon. This remarkable advancement finds its origin in the design and synthesis of novel organic and polymer semiconductors with electron donating and electron accepting properties, next to the optimization of the solar cell device architecture. The organic semiconductors used in these devices have to meet several chemical, optical, electronic, and morphological requirements to provide such high efficiencies. The chemical structure, intrachain defects, optical band gap, redox potentials, molecular weight, processing conditions, charge transport layers, and device architectures all exert important roles to reach the intrinsic limits of these materials. Recent progress on developing new donor and acceptor polymers and molecules, combined improved device layouts, will be presented that result in organic solar cells with power conversion efficiencies close to 18%. Detailed analysis of these devices reveals that the feature low energy losses and relatively low energetic disorder at the optical band gap. This analysis provides directions for further advancements.
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