Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide‐Based Kesterite Solar Cells,Solar RRL

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Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide‐Based Kesterite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-01-24 , DOI: 10.1002/solr.201900521
Stener Lie ₁ , Wenjie Li _{1,

2} , Shin Woei Leow _{1,

2} , Douglas M. Bishop ₃ , Oki Gunawan ₃ , Lydia Helena Wong _{1,

2}

Affiliation

Cation substitution is one of the effective ways to improve Cu₂ZnSn(S,Se)₄ (CZTSSe) photovoltaic performance. However, the commonly reported substitutes, Ag and Cd, are not ideal as they detract from the earth‐abundant and nontoxic motivation of CZTSSe. Herein, the role of Mn substitution in sulfide and sulfoselenide films are compared in terms of optoelectronic properties and device performance. CZT(S,Se) + CMZT(S,Se) double‐layered structures are fabricated by a sol–gel spin‐coating method with variations in the CMZT(S,Se) layer thickness. It is found that a smaller amount of Mn is required to achieve the highest photovoltaic performance in sulfoselenide films in comparison with sulfide‐based films. All device parameters (particularly V_oc and fill factor) of the sulfoselenide films are improved as compared with the sulfide system. Using a combination of capacitance–voltage, drive‐level capacitance profiling, and photoluminescence (PL), it is found that the sulfoselenide film has a smaller interface defect density and higher hole mobility and PL intensity, which suggest much more effective charge separation and transport. In contrast, in double‐layer sulfide films, Mn reduces the acceptor defect level of the absorber.

中文翻译：

比较Mn取代在硫化物和基于硫硒化物的Kesterite太阳能电池中的作用

阳离子取代是提高Cu ₂ ZnSn（S，Se）₄（CZTSSe）光伏性能的有效方法之一。但是，通常报道的替代品Ag和Cd不利于CZTSSe的富于地球和无毒的动机，因此不理想。本文中，根据光电性能和器件性能比较了Mn取代在硫化物和磺化硒化物膜中的作用。CZT（S，Se）+ CMZT（S，Se）双层结构是通过溶胶-凝胶旋涂法制造的，其中CMZT（S，Se）层的厚度有所变化。已经发现，与基于硫化物的薄膜相比，在磺化硒化物薄膜中实现最高的光伏性能需要更少量的Mn。所有设备参数（尤其是V _oc与硫化体系相比，磺化硒化物薄膜的填充率和填充率）得到改善。通过将电容电压，驱动级电容分析和光致发光（PL）结合使用，发现磺化硒化物薄膜的界面缺陷密度较小，空穴迁移率和PL强度较高，这表明电荷分离和传输更为有效。相反，在双层硫化物膜中，Mn会降低吸收剂的受体缺陷水平。

更新日期：2020-01-24

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