Electrodeposition of Cu thin film assisted by Cu nanoparticles for Cu2ZnSnSe4 solar cell applications
Electrodeposition of Cu thin film assisted by Cu nanoparticles for Cu2ZnSnSe4 solar cell applications
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Cu纳米粒子辅助电沉积Cu薄膜在Cu2ZnSnSe4太阳能电池中的应用
DOI：
10.1007/s00339-019-2800-9
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发表时间：
2019
影响因子：
2.7
通讯作者：
Zhang Yi
中科院分区：
文献类型：
--
作者：
Zhang Zhaojing;Guo Jiajia;Gao Shoushuai;Ao Jianping;Yao Liyong;Bi Jinlian;Gao Qing;Jeng Ming Jer;Sun Guozhong;Zhou Zhiqiang;Liu Fangfang;Sun Yun;Zhang Yi
在钼衬底上电沉积高质量的铜薄膜是利用电沉积技术制备高效Cu2SnZnSe4(CZTSe)太阳电池的关键。在这项研究中，我们报道了一种利用在钼衬底上预埋的铜纳米颗粒来修饰铜薄膜表面形貌的新方法。将预制的铜薄膜浸泡在盐酸溶液中，制备出尺寸和密度可控的铜纳米粒子。利用这些铜纳米粒子作为电沉积过程中的核点，在简单的盐溶液中(不添加任何添加剂)成功地电沉积了致密的扁平的铜薄膜，而不需要精确地控制衬底的性质和沉积参数。由于电沉积获得了高质量的铜薄膜，获得了颗粒致密均匀的CZTSe薄膜。结果，CZTSe吸收体中的载流子密度显著提高，并抑制了由低形貌金属前驱体引起的深能级缺陷。最后制作了功率转换效率为7.36%的CZTSe太阳电池。
Electrodepositing high-quality Cu thin film on Mo substrate is important for fabricating high-efficiency Cu2SnZnSe4 (CZTSe) solar cells via the electrodeposition technique. In this study, a novel route to modify the surface morphology of Cu thin film is reported by utilizing pre-embedded Cu nanoparticles on Mo substrate. The Cu nanoparticles with controlled size and density are synthesized after soaking the pre-fabricated Cu thin films in HCl solution. After employing these Cu nanoparticles to act as nuclei points during the electrodeposition process, compact and flat Cu thin films are successfully electrodeposited in simple salt solution (with no additives) without the precise control of substrate properties and deposition parameters. Due to the electrodeposition of high-quality Cu thin films, CZTSe thin films with compact and uniform grains are prepared. As a result, the carrier density in the CZTSe absorber is significantly improved and a deep level defect induced by the poor morphology metal precursor is inhibited. Finally, a CZTSe solar cell with a power conversion efficiency of 7.36% is fabricated.