BaCu2Sn(S,Se)4: Earth-Abundant Chalcogenides for Thin-Film Photovoltaics
BaCu2Sn(S,Se)4: Earth-Abundant Chalcogenides for Thin-Film Photovoltaics
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DOI：
10.1021/acs.chemmater.6b01832
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发表时间：
2016-06
影响因子：
8.6
通讯作者：
Donghyeop Shin;B. Saparov;Tong Zhu;W. Huhn;V. Blum;D. Mitzi
中科院分区：
文献类型：
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作者：
Donghyeop Shin;B. Saparov;Tong Zhu;W. Huhn;V. Blum;D. Mitzi
硫属化物如CdTe、Cu（In，Ga）（S，Se）2（CIGSSe）和Cu 2 ZnSn（S，Se）4（CZTSSe）已经使薄膜光伏性能取得了显著进步，但是关于构成元素的（i）毒性（CdTe）和（ii）稀缺性（CIGSSe/CdTe）以及（iii）限制进一步效率改进的不可避免的反位无序（CZTSSe）仍然存在担忧。在这项工作中，我们表明，一个不同的材料类，BaCu 2SnSexS 4-x（BCTSSe）系统，提供了一个有前景的路径，以规避困难（一-三），并针对新的环境友好和地球丰富的吸收剂。反位无序和相关的带拖尾不鼓励在BCTSSe由于大的Ba 2+阳离子的不同的协调环境。事实上，突变的吸收边和尖锐的相关光致发光发射表明BCTSSe中的带拖尾相对于CZTSSe的影响降低。我们对BCTSSe的实验和计算研究表明，0 ≤ x ≤ 4的组合物具有可调的近红外光谱。
Chalcogenides such as CdTe, Cu(In,Ga)(S,Se)2 (CIGSSe), and Cu2ZnSn(S,Se)4 (CZTSSe) have enabled remarkable advances in thin-film photovoltaic performance, but concerns remain regarding (i) the toxicity (CdTe) and (ii) scarcity (CIGSSe/CdTe) of the constituent elements and (iii) the unavoidable antisite disordering that limits further efficiency improvement (CZTSSe). In this work, we show that a different materials class, the BaCu2SnSexS4–x (BCTSSe) system, offers a prospective path to circumvent difficulties (i–iii) and to target new environmentally friendly and earth-abundant absorbers. Antisite disordering and associated band tailing are discouraged in BCTSSe due to the distinct coordination environment of the large Ba2+ cation. Indeed, an abrupt absorption edge and sharp associated photoluminescence emission demonstrate a reduced impact of band tailing in BCTSSe relative to CZTSSe. Our combined experimental and computational studies of BCTSSe reveal that the compositions 0 ≤ x ≤ 4 exhibit a tunable nea...