Affiliation:
1. International Iberian Nanotechnology Laboratory Avenida Mestre José Veiga s/n 4715-330 Braga Portugal
2. Departamento de Química e Bioquímica Faculdade de Ciências Universidade do Porto Rua do Campo Alegre 687 4169-007 Porto Portugal
3. Department of Chemistry and Industrial Chemistry Università degli Studi di Genova via Dodecaneso 31 16146 Genova Italy
Abstract
Cu(In,Ga)Se2 (CIGSe) thin‐film solar cells are a commercial photovoltaic technology that provides sustainable power. Herein, the formation of Zn1−xSnxOy (ZTO) thin films is studied as Cd‐free buffer layer by chemical bath deposition (CBD) suitable for CIGSe solar cell devices. ZTO films are obtained by CBD onto soda lime glass, by modifying a reported procedure otherwise leading to columnar ZnO thin films. These ZTO films show a flatter morphology compared to the reference ZnO due to inhibition of the columnar growth. In addition, a nontrivial increase in the bandgap is observed by enhancing Sn concentration. When a concentration of 20% [Sn]/([Sn] + [Zn]) (where [Sn] and [Zn] are the molar concentrations of Sn and Zn, respectively) is employed in the chemical bath, the resulting buffer layer allows the CIGSe solar cell to achieve similar performance as with a CdS buffer layer (average efficiency of (11 ± 2)%), yielding a maximum efficiency of 10.4%, with an average of (9 ± 2)%.
Funder
Fundação para a Ciência e a Tecnologia
H2020 Marie Skłodowska-Curie Actions
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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