Characterisation and simulation of an n-CdO/p-Si heterostructure for solar cell applications (original) (raw)

Abstract

Cadmium oxide (CdO) is a semiconductor with promising electrical and optical properties. Pure CdO is an n-type degenerate semiconductor and is almost entirely transparent in the optical region of the electromagnetic spectrum. Thus, the interest in its study as a possible device for photo detectors and solar cells has increased significantly. However real solar cells, based on an n-CdO/p-Si heterostructures, show poor photovoltaic performance [1]. In this work numerical simulation is used to elucidate this poor performance. Figure 1 shows measured photovoltaic performance of an n-CdO/p-Si heterostructures [1]. We have simulated the same structure by considering two cases. The first is that CdO is a perfect material. The second models CdO as a semiconductor with continuous distribution of states in its band gap similar to an amorphous semiconductor. The density of states model used here is composed of four bands: two tail bands (a donor-like g_TD (E) and an acceptor-like g_TA (E)) and...

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