A polymer acceptor with an optimal LUMO energy level for all-polymer solar cells.

ABSTRACT: A key parameter for polymer electron acceptors is the lowest unoccupied molecular orbital (LUMO) energy level (E_LUMO). For state-of-the-art polymer electron acceptors based on the naphthalene diimide (NDI) unit, their E_LUMO are low-lying and cannot be tuned, leading to a low open-circuit voltage (V_oc) of the resulting all-polymer solar cells (all-PSCs). We report that polymer electron acceptors based on the double B←N bridged bipyridine (BNBP) unit exhibit tunable E_LUMO because of their delocalized LUMOs over polymer backbones. The E_LUMO of the copolymer of the BNBP unit and selenophene unit (P-BNBP-Se) is lower by 0.16 eV than that of the copolymer of the BNBP unit and thiophene unit (P-BNB

SUBMITTER: Ding Z 

PROVIDER: S-EPMC6024205 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature