Improved performance of quantum dot solar cells by type-II InAs/GaAsSb structure with moderate Sb composition.
Improved performance of quantum dot solar cells by type-II InAs/GaAsSb structure with moderate Sb composition.
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DOI:
10.1016/j.heliyon.2023.e20005
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发表时间:
2023-09
期刊:
影响因子:
4
通讯作者:
Yang, Tao
中科院分区:
文献类型:
--
作者:
Wang, Shenglin;Wang, Shuai;Yang, Xiaoguang;Lv, Zunren;Chai, Hongyu;Meng, Lei;Yang, Tao
We demonstrate improved performance of quantum dot solar cells (QDSCs) by type-II InAs/GaAsSb structure. With a moderate Sb composition of 18% and high quality QDs, a high efficiency of 17.31% under AM1.5 G illumination is achieved, showing an improvement of 11.25% in efficiency relative to type-I InAs/InGaAs QDSC. This improvement can be attributed to a high fill factor (FF) of 72.37% compared to 63% of the latter because the type-II structure effectively suppresses carrier recombination losses in QDs. As Sb composition increases to 24%, the FF maintains at a high level of 72.67%, but the efficiency drops to 17% because the elevation of valence band (VB) in GaAsSb capping layer further enhances the hole confinement. And the confinement reduces external quantum efficiency (EQE) and short-circuit current density (Jsc). These results prove the potential of improving efficiency of QDSCs by type-II structure.
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