Multistep design simulation of heterojunction solar cell architecture based on SnS absorber

Abstract

We report, a novel multi-step design simulation results on SnS absorber based solar cell architecture with is 4.5 times efficiency enhancement vis-à-vis reported experimental results. It is ascribed to an efficient control over inherent loss mechanism via device design novelty. The multi-step design modification in the device architecture comprised; (a) absorber bandgap widening at the interface, (b) considering donor interfacial defects at the SnS/buffer junction, (c) limiting the presence of the majority carrier at the interface via asymmetric doping at the SnS/buffer interfaces, and (d) employing back surface field at the absorber/back metal contact interface. This design approach resulted in achieving an optimal design configuration that exhibited significant improvements in open circuit voltage (119%), short circuit current (61%), fill factor (25.8%), and efficiency (347.6%) compared to the experimental benchmark. An overall effect of improved parameters, in the modified architecture of the SnS absorber based solar cell, led to substantial enhancement in efficiency close to ∼19% vis-à-vis 4.23% reported in literature.