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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Solution-Processed Cu2ZnSnS4 Nanocrystal Solar Cells: Efficient Stripping of Surface Insulating Layers Using Alkylating Agents
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Solution-Processed Cu2ZnSnS4 Nanocrystal Solar Cells: Efficient Stripping of Surface Insulating Layers Using Alkylating Agents

机译：固溶处理的Cu2ZnSnS4纳米晶体太阳能电池：使用烷基化剂有效剥离表面绝缘层

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摘要

Solution-processed photovoltaic (PV) devices based on semiconductor nanocrystals (NCs) such as Cu2ZnSnS4 (CZTS) and CuInS2 (CIS) are attracting much attention for use in next-generation solar cells. However, the performance of NC-based devices is hindered by insulating surface-capping ligands that limit transfer/transport of charged carriers. Here, to remove surface-capping ligands (long-chain fatty amines) from NCs, we use the strong alkylating agent methyl iodide, which converts primary amines to quaternary amines that have low coordinating affinity to the NC surface. X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy analyses confirm the successful removal of capping ligands from the CZTS surface after treatment with methyl iodide without changing the crystal structure of CZTS. CZTS and CIS NC-based devices treated with methyl iodide exhibit a reproducible PV response under simulated sunlight. The developed route can potentially enhance the performance of NC-based devices used in a broad range of applications.
机译：基于诸如Cu2ZnSnS4（CZTS）和CuInS2（CIS）之类的半导体纳米晶体（NC）的溶液处理光伏（PV）器件引起了下一代太阳能电池的广泛关注。但是，基于NC的设备的性能受到绝缘表面封盖配体的限制，该配体限制了带电载流子的传输/传输。在这里，为了从NC中除去表面封盖的配体（长链脂肪胺），我们使用了强烷基化剂甲基碘，该试剂将伯胺转化为对NC表面具有低配位亲和力的季胺。 X射线衍射，拉曼光谱和傅里叶变换红外光谱分析证实，在不改变CZTS晶体结构的情况下，用碘甲烷处理后，成功地从CZTS表面去除了封端配体。用甲基碘处理过的基于CZTS和CIS NC的设备在模拟阳光下显示出可重现的PV响应。开发的路线可以潜在地提高广泛应用中基于NC的设备的性能。

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