Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
A series of dithieno[2,3-d:20,30-d0]-benzo[1,2-b:4,5-b0]dithiophene (DTBDT)-based small molecule donors was incorporated in small molecule solar cells with fullerene and non-fullerene small molecule acceptors. DTBDT-based small molecules with different side chains, DTBDT-Rho and DTBDT-S-Rho, were used to investigate the influence of side chain in DTBDT-based small molecules on the photovoltaic performance. The photovoltaic properties of two DTBDT-based small molecules were systemically studied in bulk heterojunction solar cells employing PC71BM as a fullerene acceptor and O-IDTBR as a non-fullerene acceptor. The solar cell device with DTBDT-Rho as an electron donor and PC71BM as a fullerene electron acceptor exhibited power conversion efficiencies (PCEs) over 7%. When O-IDTBR was employed as a non-fullerene acceptor, the solar cell device gave PCEs of over 4%. The DTBDT-S-Rho:PC71BM and DTBDT-S:O-IDTBR solar cells showed PCEs over 5% and 2%, respectively. We performed the morphological analyses and charge carrier dynamics study for each blend to understand the structure-property relations and address the limitations and requirements of all-small molecule solar cells incorporating DTBDT-based small molecule donors and non-fullerene small molecule acceptors. The study of morphology and charge carrier dynamics revealed that the enhanced molecular aggregation of DTBDT-S-Rho with alkylthio group led to large-scale phase separation and unfavorable charge transfer, which were mainly responsible for decreased PCEs, while improved crystallinity of DTBDT-S-Rho brought increased hole mobilities. The large-scale phase separation was also a key factor lowering photovoltaic performances in all-small molecule solar cells. In DTBDT-based small molecule:O-IDTBR blends, domain sizes over 100 nm limited the charge transfer process, indicating that modulation of phase separation is important for improving photovoltaic performances of the DTBDT-small molecules:non-fullerene acceptor systems.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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