期刊
NANO ENERGY
卷 51, 期 -, 页码 736-744出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.07.022
关键词
Lewis base anion doping; TBAA; Electron extraction; Non-geminate recombination; Non-fullerene acceptor
类别
资金
- National Natural Science Foundation of China (NSFC) [21674006]
- 111 Project [B14009]
- NSFC [21773045]
- National Key Research and Development Program of China [2017YFA0206600]
Interfacial charge extraction and recombination play a critical role in photovoltaic characteristics of organic bulk heterojunction solar cells. Here we propose a methodology based on Lewis base n-doping with tetrabutylammonium acetate (TBAA) salts to boost charge extraction and resultant power conversion efficiencies (PCE) in OPVs with non-fullerene acceptors (NFA). Based on the PBDB-T:IT-M model system, we show that the TBAA doping via interfacial electron transfer is advantageous in maintaining the preferential intermolecular stacking and built-in potential necessitated for device operation compared to conventional bulk doping. Benefitting from the melioration of interfacial charge extraction and recombination, gains of photocurrent and fill factor are obtained in PBDB-T: IT-M solar cells. We found that the energy of charge transfer states after doping becomes slightly raised, which promotes the mitigation on radiative losses for open-circuit voltage. Furthermore, the described TBAA doping is found with the generality in modifying the device characteristics in non-fullerene based organic solar cells with different LUMO energies. Based on the PBDBT-2F:IT-4F BHJ blends, the solar cell doped with TBAA yields a PCE exceeding 13% without electron-transporting layer (ETL). This strategy allows for high efficiency ETL-free organic solar cells with potentials of reduced fabrication cost.
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