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Enhancing Grain Growth for Efficient Solution-Processed (Cu,Ag)2ZnSn(S,Se)4 Solar Cells Based on Acetate Precursor
journal contribution
posted on 2020-03-13, 15:16 authored by Yafang Qi, Yao Liu, Dongxing Kou, Wenhui Zhou, Zhengji Zhou, Qingwen Tian, Shengjie Yuan, Yuena Meng, Sixin WuMaterial
crystallinity is the overriding factor in the determination of the
photoelectric properties of absorber materials and the overall performance
of the photovoltaic device. Nevertheless, in the Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic device, the bilayer or trilayer structure
for the absorber has been broadly observed, which is generally harmful
to the cell performance because the probability of photogenerated
carrier recombination at grain boundaries significantly increased.
Herein, our experiment reveals that the application of anions to a
new family of (Cu,Ag)2ZnSn(S,Se)4 (CAZTSSe)
materials leads to an increase in grain size and crystallinity. It
is inspiring that using acetate starting materials in the precursor
solution, a uniform, compact, and pinhole-free CAZTS precursor film
was obtained, and the smoothness of the films surpassed that of films
fabricated from the oxide route. More importantly, the crystallization
of the CAZTSSe film has been considerably enhanced after selenization,
and large grains going through the entire absorber layer was successfully
obtained. Additionally, it is observed that the Voc accompanied by excellent crystallinity improved significantly
due to the pronouncedly reduced carrier recombination loss at grain
boundaries. As a consequence, the power conversion efficiency (PCE)
of the CAZTSSe photovoltaic device is successfully increased from
10.35% (oxide route) to 11.32% (acetate route). Importantly, our work
attests to the feasibility of tuning the crystallization of the CZTSSe
film by simple chemistry.
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CAZTSSe photovoltaic devicephotogenerated carrier recombinationcarrier recombination lossmaterialpower conversion efficiencyPCEoxide routeCZTSSegrain boundariesAcetate Precursor Material crystallinitycrystallizationphotovoltaic deviceCuacetateabsorberpinhole-free CAZTS precursor filmEnhancing Grain GrowthperformanceZnSn
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