Fig. 4
TRMC evaluations of OPV films. a φΣμ transients of P3HT:PCBM with changing blend ratio (1:0 as the blue line to 1:1 as the orange line). The excitation wavelength (λex) was 355 nm. b PCE vs. φΣμmax of P3HT:PCBM (1:1) with different solvents (DCB, CB, CF) and thermal annealing temperatures. λex = 355 nm. The solid line is a least-mean-square fitted inverse exponential function. c PCE VOC–1 vs. Δσmax of NBPs:PCBM (λex = 355 nm). The circle, triangle, square, and diamond correspond to NBPs:PCDTBT, PCPDTBT, PBDTTPD, and PBDTTT-CF, respectively. The open and closed symbols are without additive and with 1,8-diiodooctane (DIO), respectively. d PCE VOC–1 vs. Δσmax of NBPs:PCBM (λex = white light pulse). a, b and c, d are reproduced from [92] (Copyright: 2011 Wiley-VCH) and [46] (Copyright: 2012 American Chemical Society), respectively, with permission
