Interface-enhanced germanium selenide solar cells comprising an ultrathin and uniform antimony selenide buffer layer via hydrothermal approach

IF 6.3 2区 材料科学 Q2 ENERGY & FUELS Solar Energy Materials and Solar Cells Pub Date : 2024-10-31 DOI:10.1016/j.solmat.2024.113260
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Abstract

Germanium selenide (GeSe) is a promising thin film photovoltaic absorber material owing to its excellent optoelectronic properties, high stability, and low toxicity. Interface engineering by introducing an ultrathin antimony selenide (Sb2Se3) buffer layer between the CdS electron transport layer and GeSe absorber layer is an effective technique for enhancing solar cell performance. However, the key to this technique is the fabrication of a uniform and smooth Sb2Se3 buffer layer with minimal thickness. In this study, instead of the conventional closed-space sublimation method, a hydrothermal method was employed to slowly grow an Sb2Se3 buffer layer with a thickness of approximately 8 nm. The Se/Na2SO3 molar ratio in the selenium source during the hydrothermal synthesis was adjusted; a molar ratio of 1:2 led to an uneven Sb2Se3 buffer layer thickness, whereas a molar ratio of 1:10 resulted in the formation of Sb2O3 particles on the buffer layer surface. When the Se/Na2SO3 molar ratio was 1:6, a smooth, uniform, dense, and impurity-free Sb2Se3 buffer layer was obtained, achieving the highest efficiency of 3.33 % in a GeSe solar cell. Moreover, GeSe solar cells with hydrothermally grown Sb2Se3 buffer layers demonstrated superior device interface properties and efficiency comparable with those using Sb2Se3 buffer layers deposited via closed-space sublimation. This technique offers an effective method for steadily improving the performance of GeSe solar cells.

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通过水热法获得包含超薄均匀硒化锑缓冲层的界面增强型硒化锗太阳能电池
硒化锗(GeSe)具有优异的光电特性、高稳定性和低毒性,是一种前景广阔的薄膜光伏吸收材料。在硒化镉电子传输层和硒化锗吸收层之间引入超薄硒化锑(Sb2Se3)缓冲层的界面工程是提高太阳能电池性能的有效技术。然而,该技术的关键在于制造厚度最小、均匀光滑的 Sb2Se3 缓冲层。在本研究中,我们没有采用传统的封闭空间升华法,而是采用水热法缓慢生长出厚度约为 8 纳米的 Sb2Se3 缓冲层。在水热合成过程中,可以调整硒源中的 Se/Na2SO3 摩尔比;摩尔比为 1:2 时,Sb2Se3 缓冲层厚度不均匀,而摩尔比为 1:10 时,缓冲层表面会形成 Sb2O3 颗粒。当 Se/Na2SO3 摩尔比为 1:6 时,获得了光滑、均匀、致密且无杂质的 Sb2Se3 缓冲层,在 GeSe 太阳能电池中实现了 3.33% 的最高效率。此外,使用水热法生长的 Sb2Se3 缓冲层的 GeSe 太阳能电池显示出卓越的器件界面特性,其效率可与使用闭空间升华法沉积的 Sb2Se3 缓冲层的太阳能电池相媲美。该技术为稳步提高 GeSe 太阳能电池的性能提供了一种有效方法。
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来源期刊
Solar Energy Materials and Solar Cells
Solar Energy Materials and Solar Cells 工程技术-材料科学:综合
CiteScore
12.60
自引率
11.60%
发文量
513
审稿时长
47 days
期刊介绍: Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.
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Two-step nested optical-electrical Monte-Carlo approach to analyze the influence of tolerances on Micro-CPV module performance Enhancing efficiency of dense array CPV receivers with controlled DC-DC converters and adaptive microfluidic cooling under non-uniform solar irradiance In situ high-temperature emissivity measurements of heat-treated, silicon coated stainless steel for solar thermal applications Effect of manufacturing tolerances on Micro-CPV assemblies: A quantitative approach based on statistical modeling Interface-enhanced germanium selenide solar cells comprising an ultrathin and uniform antimony selenide buffer layer via hydrothermal approach
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