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Schematic of the designed PC-OSC (a) and the conventional OSC (b). (c) Calculated overall absorptivity ATotal of the conventional planar OSC as a function of the ITO thickness, where the OSC exhibiting the largest overall absorptivity with the ITO thickness of 130 nm is denoted as the reference OSC. (d) Simulated absorptivity spectra in the P3HT:PCBM layer of the planar PC-OSC for normal TM-polarized incidence with different number of PC bilayers. In the calculations, the lattice parameters are chosen as d 1 = 64 nm and d 2 = 94 nm. The absorptivity spectra of the planar reference OSC is also given by the blue solid line. (e) Calculated overall absorptivity ATotal of the planar PC-OSC as a function of the number of PC bilayers, where the PC-OSC with two PC bilayers exhibits an overall absorptivity of ∼35% higher than the reference OSC.
(a) Calculated overall absorptivity ATotal of the planar PC-OSC with two PC bilayers as a function of different combinations of d 1 and d 2. The blue star represents the designed PC-OSC (d 1 = 64 nm, d 2 = 94 nm) discussed in this work. (b) Calculated OTS wavelength as a function of the active layer thickness, where the active layer is chosen as P3HT:PCBM (red-circle-line) or a layer with RI = 1.7 (blue-square-line). The red dashed circle indicates the region with the larger OTS bandwidth. The insets show the RI of P3HT:PCBM and the theoretical model for the analysis of the larger OTS bandwidth (see Eq. (1)).
Simulated absorptivity spectra in the P3HT:PCBM layer of the corrugated PC-OSC with various grating periods fornormal (a) TM- and (b) TE-polarized incidence. (c) Comparison of the absorptivity spectra for the planar PC-OSC and corrugated reference OSC with a period of 200 nm, as they exhibit almost the same overall absorptivity. (d) Simulated TM-polarized field amplitude distributions in the PC-OSC with λ = 715 nm and Λ = 360 nm. (e) Simulated TE polarized field amplitude distributions in the PC-OSC with λ = 465 nm and Λ = 280 nm.
Calculated absorptivity of the planar (dashed line) and corrugated (symbol) structures. The red and blue colors represent the results of the PC-OSC and the reference OSC, respectively. The squares, triangles, and circles give the ATM , ATE , and ATotal of the corrugated structures with various grating periods, respectively.
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