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1D/3D Alloying Induced Phase Transition in Light Absorbers for Highly Efficient Sb2Se3 Solar Cells
Solar RRL ( IF 7.9 ) Pub Date : 2020-02-25 , DOI: 10.1002/solr.202000054
Chunsheng Guo 1 , Xiaoyang Liang 1 , Tao Liu 1 , Yufan Liu 1 , Lin Yang 1 , Weidong Lai 1 , Ruud E. I. Schropp 2 , Dengyuan Song 1, 3 , Yaohua Mai 2 , Zhiqiang Li 1
Affiliation  

A simple binary inorganic antimony selenide (Sb2Se3) compound is attractive as a promising light absorber for low‐cost and high‐efficiency photovoltaics. The external quantum efficiencies of Sb2Se3 solar cells are now approaching the optical limit values, which are comparable with the traditional well‐developed solar cells (such as Si, CuInGaSe2, CdTe, etc). However, the power conversion efficiency of the Sb2Se3 devices is constrained by the open‐circuit voltage (VOC) deficit, due to the intrinsic high resistivity and low element‐doping efficiency in such one‐dimensional (1D) crystals. Herein, a highly conductive, three‐dimensional (3D) crystal‐structure AgSbSe2 phase, formed by phase transition from low symmetry binary Sb2Se3, is introduced to control the doping density in the alloyed (Sb2Se3)x(AgSbSe2)1−x films utilizing configurational entropy. Guided by this alloying concept, 1D–3D (Sb2Se3)x(AgSbSe2)1−x alloy films with tunable doping densities are obtained. As a consequence, a noticeable improvement in VOC by >18% is observed in solar cells based on the (Sb2Se3)x(AgSbSe2)1−x alloy absorber layer, compared with the reference cell with a pure Sb2Se3 absorber, leading to a high conversion efficiency of 7.8%. This alloying model provides a universal approach to control the photoelectrical properties for high‐efficiency Sb2Se3‐based solar cells.

中文翻译:

1D / 3D合金化在高效Sb2Se3太阳能电池的吸光剂中引起的相变

一种简单的二元无机硒化硒(Sb 2 Se 3)化合物作为低成本和高效率光伏电池的有前途的光吸收剂具有吸引力。Sb 2 Se 3太阳能电池的外部量子效率现已接近光学极限值,可与传统发达的太阳能电池(如Si,CuInGaSe 2,CdTe等)相提并论。但是,Sb 2 Se 3器件的功率转换效率受到开路电压(V OC)缺陷,因为此类一维(1D)晶体固有的高电阻率和低元素掺杂效率。本文介绍了一种由低对称二元Sb 2 Se 3的相变形成的高导电三维(3D)晶体结构AgSbSe 2相,以控制合金化(Sb 2 Se 3x(利用结构熵的AgSbSe 21- x薄膜。在这种合金化概念的指导下,1D–3D(Sb 2 Se 3x(AgSbSe 21- x获得具有可调掺杂密度的合金膜。因此,在一个显着的改进V OC由> 18%的在基于(SB在太阳能电池上观察到23X(AgSbSe 21- X合金吸收层,具有与纯锑参考单元相比较2 Se 3吸收剂,导致7.8%的高转化效率。这种合金化模型提供了一种通用方法来控制基于Sb 2 Se 3的高效太阳能电池的光电性能。
更新日期:2020-02-25
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