Calcium-stannous oxide solid solutions for solar devices

Ned Thaddeus Taylor,Arnaldo Galbiati,Monica Saavedra,Steven Paul Hepplestone

doi:10.1063/5.0024947

Ned Thaddeus Taylor, Arnaldo Galbiati + Show 2 more

Open Access

https://doi.org/10.1063/5.0024947

Copy DOI

Abstract

In this study, solid solutions formed of SnO and CaO [termed (Sn:Ca)xO] are explored as potential solar active layers. The results indicate that a ratio of x=7:1 leads to a fundamental direct bandgap of 1.56 eV. In order to promote the transport of excited charge carriers from within the active layer, appropriately aligned hole/electron transport layers need to be identified. To this end, a set of results are presented for the electronic band alignment of (Sn:Ca)7:1O with a selection of oxide transport layers, with and without oxygen vacancies. From this, it is recommended that a CaO/(Sn:Ca)7:1O/TiO2 device shows the most potential for an all-oxide solar cell.

Highlights

In this study, solid solutions formed of SnO and CaO [termed (Sn:Ca)xO] are explored as potential solar active layers
Having established a potential photovoltaic active layer, we explore a set of candidate transport layers for the (Sn:Ca)7:1O solid scitation.org/journal/apl solution to aid in the separation of charge carriers
To consider the effects of oxygen vacancies in potential all-oxide solar cell setups, we model an equivalent concentration of 1 oxygen vacancy present per 24 TiO2 unit (1:19 Â 1021 cmÀ3)

Summary

Introduction

ABSTRACT In this study, solid solutions formed of SnO and CaO [termed (Sn:Ca)xO] are explored as potential solar active layers. A set of results are presented for the electronic band alignment of (Sn:Ca)7:1O with a selection of oxide transport layers, with and without oxygen vacancies.

Results

Conclusion