Journal article Open Access

Improvement of kesterite solar cell performance by solution synthesized MoO3 interfacial layer

Samaneh Ranjbar, Guy Brammertz, Bart Vermang, Afshin Hadipour, Shuren Cong, Katsuaki Suganuma, Thomas Schnabel, Marc Meuris, A. F. da Cunha, and Jef Poortmans


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    <subfield code="a">Samaneh Ranjbar, Guy Brammertz, Bart Vermang, Afshin Hadipour, Shuren Cong, Katsuaki Suganuma, Thomas Schnabel, Marc Meuris, A. F. da Cunha, and Jef Poortmans</subfield>
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    <subfield code="a">Development of thin film Solar cells based on WIde band Gap kesterite absorbers</subfield>
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    <subfield code="a">&lt;p&gt;In this study, an ultra-thin MoO&lt;sub&gt;3&lt;/sub&gt; layer synthesized by a solution-based technique is introduced as a promising interfacial layer to improve the performance of kesterite Cu&lt;sub&gt;2&lt;/sub&gt;ZnSnSe&lt;sub&gt;4&lt;/sub&gt; (CZTSe) solar cell. Solar cells with 10 nm of MoO&lt;sub&gt;3&lt;/sub&gt; between Mo rear contact and CZTSe had larger minority carrier life time and open-circuit voltage compared to the reference solar cells. Temperature dependent current density–voltage measurement indicated that the activation energy (&lt;em&gt;E&lt;/em&gt;&lt;sub&gt;A&lt;/sub&gt;) of the main recombination is higher (∼ 837 meV) in solar cells with MoO&lt;sub&gt;3&lt;/sub&gt; layer, as compared to conventional solar cells where &lt;em&gt;E&lt;/em&gt;&lt;sub&gt;A&lt;/sub&gt; ∼ 770 meV, indicating reduced interface recombination. A best efficiency of 7.1% was achieved for a SLG/Mo/MoO&lt;sub&gt;3&lt;/sub&gt;/CZTSe/CdS/TCO solar cell compared to the reference solar cell SLG/Mo/CZTSe/CdS/TCO for which 5.9% efficiency was achieved.&lt;/p&gt;</subfield>
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