Fig. 4: Performance of OPV cells under indoor lighting.

a J–V characteristics of OPV cells are shown corresponding to BHJ blends of PTB7-Th:PC₇₁BM and PTB7-Th:EH-IDTBR under white LED illumination. b Graph showing the spectral overlap of the EQE of the PTB7-Th:PC₇₁BM and PTB7-Th:EH-IDTBR blends (left axis) with the spectrum of the white LED (right axis).