From Event: SPIE Organic Photonics + Electronics, 2017
In polymer solar cells (PSCs), molecular design and modulation of chemical composition of the active layer materials are of critical importance for enhancing power conversion efficiencies (PCEs). In our previous work, a PCE of 11.2% was demonstrated by using a new combination of a polymer donor named PBDB-T and a small molecular acceptor (SMA) named ITIC. In order to optimized photovoltaic performance of the PBDB-T:ITIC-based PSCs, subtle chemical modifications of end-groups (EGs) were applied to precisely optimize the molecular energy level of ITIC. By successively introducing one- and two- methyl substituents, the lowest unoccupied molecular orbital (LUMO) levels of the two new acceptors (IT-M and IT-DM) were raised by 0.04 eV and 0.08 eV, respectively, compared to ITIC. Hence, improved open-circuit voltages (VOC) of 0.94 V and 0.97 V were obtained in the corresponding PSCs. Benefiting from the optimized molecular energy levels in the PBDB-T:IT-M-based blend, a PCE of 12.05% was obtained. Furthermore, we also introduced the third component Bis-PCBM to enhance light absorption of the PBDB-T:IT-M blend in the short wavelength region. In the ternary PSCs based on PBDB-T:IT-M:Bis-PCBM, a higher PCE of 12.2% was achieved.
Sunsun Li, Wenchao Zhao, Shaoqing Zhang, and Jianhui Hou, "Fullerene-free polymer solar cells with over 12% efficiencies (Conference Presentation)," Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 103630J (Presented at SPIE Organic Photonics + Electronics: August 09, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2271746.5581136170001.
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