Two-Step Cooling Strategy for Synergistic Control of Cu_(Zn) and Sn_(Zn) Defects Enabling 12.87 Efficiency (Ag,Cu)_2ZnSn(S,Se)_4 Solar Cells

Hang Geng; Mengyang Wang; Songfan WangDongxing KouZhengji ZhouWenhui ZhouYafang QiShengjie YuanLitao HanYuena MengSixin Wu

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Two-Step Cooling Strategy for Synergistic Control of Cu_(Zn) and Sn_(Zn) Defects Enabling 12.87 Efficiency (Ag,Cu)_2ZnSn(S,Se)_4 Solar Cells

机译：Two-Step Cooling Strategy for Synergistic Control of Cu_(Zn) and Sn_(Zn) Defects Enabling 12.87 Efficiency (Ag,Cu)_2ZnSn(S,Se)_4 Solar Cells

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Abundant intrinsic defects and defect clusters in Cu_2ZnSn(S,Se)_4 (CZTSSe)solar cells lead to severe nonradiative recombination and limited photoelectricperformance. Therefore, developing effective method to suppress thedetrimental defects is the key to achieve high-efficiency solar cell. Herein, aconvenient two-step cooling strategy in selenization process is reported tosuppress the Cu_(Zn) and Sn_(Zn) defects and defect clusters synergistically. Theresults show that rapid cooling during section from selenization temperatureto turning temperature can inhibit the volatilization of Sn and restrain thecorresponding Sn-related defects, while slow cooling during the subsequenttemperature section can reduce the degree of Cu-Zn disorder. Benefittingfrom the synergistic effect of two-step cooling, a significantly lowered concentrationof Sn_(Zn) and Cu_(Zn) defect and their defect clusters [2Cu_(Zn)+Sn_(Zn)] inabsorber is observed, meanwhile, a reduced band tailing effect and promotedcarrier collection efficiency of the photovoltaic device is obtained. Finally, adevice with improved open-circuit voltage (V_(oc)) of 505.5 mV and efficiency of12.87% is achieved. This study demonstrates the impact of cooling processon defects controlling for the first time and provides a simple and effectivenew strategy for intrinsic defect control, which may be universal in otherinorganic thin film solar cells.

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来源
《Advanced functional materials》 |2023年第3期|2210551.1-2210551.8|共8页
作者
Hang Geng; Mengyang Wang; Songfan WangDongxing KouZhengji ZhouWenhui ZhouYafang QiShengjie YuanLitao HanYuena MengSixin Wu;
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Key Laboratory for Special Functional Materials of MOENational & Local Joint Engineering Research Centre for High-efficiencyDisplay and Lighting TechnologySchool of MaterialsHenan UniversityKaifeng, Henan Province 475004, P. R. China;

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正文语种英语
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band tailing; intrinsic defects; kesterite solar cells; open-circuit voltage deficits; Two-step cooling;

Two-Step Cooling Strategy for Synergistic Control of Cu_(Zn) and Sn_(Zn) Defects Enabling 12.87 Efficiency (Ag,Cu)_2ZnSn(S,Se)_4 Solar Cells

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