Analysis of the PEDOT:PSS/Si nanowire hybrid solar cell with a tail state model

In this paper, the electrical properties of the poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)/siliconnanowirehybridsolar cell have been analyzed and an optimized structure is proposed. In addition, the planar PEDOT:PSS/c-Sihybridsolar cell is also modeled for comparison. We first developed a simulation software which is capable of modeling organic/inorganichybridsolar cells by including Gaussian shape density of states into Poisson and drift-diffusion solver to present the tail states and trap states in theorganic material. Therefore, the model can handle carrier transport, generation, and recombination in both organic and inorganicmaterials. Our results show that at the applied voltage near open-circuit voltage (Voc), the recombination rate becomes much higher at the PEDOT:PSS/Si interface region, which limits the fill factor and Voc. Hence, a modified structure with a p-typeamorphous silicon(a-Si) layer attached on the interface of Si layer and an n+-type Si layer inserted near the bottom contact are proposed. The highest conversion efficiency of 16.10% can be achieved if both structures are applied.

Source: Journal of Applied Physics - December 1, 2016 Category: Physics Authors: Kuan-Ying Ho, Chi-Kang Li, Hong-Jhang Syu, Yi Lai, Ching-Fuh Lin and Yuh-Renn Wu Source Type: research