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Development of SnS/In2S3 core-shell nanoparticles for solar cell application

机译：用于太阳能电池的SnS / In2S3核壳纳米粒子的开发

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SnS nanoparticles (NPs) were synthesized by a colloidal route at low temperatures and analyzed by several characterization techniques. Whereas transmission electron microscopy (TEM) and atomic force microscopy (AFM) imaging conclusively proved quantum dot sized particles (∼4 nm) with a narrow size distribution, Torsional Resonance-Tunneling AFM and Peak Force AFM proved the conductive nature of the particles. The chemical composition, studied by energy dispersive X-ray spectroscopy (EDX) showed the ratio S:Sn of 1:1, confirming that the semiconductor is SnS and not any other compound. To passivate the QD surface and protect it from reaction to ambient, core-shell structures were made. The SnS nanoparticles (NPs) were immersed in a CBD bath for deposition of In2S3 layers. The formed core/shell SnS/In2S3 nanoparticles were separated by centrifugation and washed with ethanol. The structure of the core-shell SnS/In2S3 NPs has been studied by High Resolution TEM which showed the lattice fringes of the SnS core, surrounded by amorphous matrix, tentatively attributed to In2S3. The EDX confirms the presence of the elements expected. The absorption spectra of SnS/In2S3 nanoparticles with increasing time of CBD In2S3 clearly showed increasing band gap, attributed to thicker In2S3 shell. Research on SnS QDs embedded in CIS solar cells is in progress.
机译：SnS纳米颗粒（NPs）是在低温下通过胶体途径合成的，并通过几种表征技术进行了分析。透射电子显微镜（TEM）和原子力显微镜（AFM）成像最终证明了量子点尺寸的粒子（〜4 nm）具有窄的尺寸分布，而扭转共振隧道AFM和峰值力AFM证明了粒子的导电性质。通过能量色散X射线光谱法（EDX）研究的化学组成显示出S：Sn的比为1：1，这证实了半导体是SnS，而不是其他任何化合物。为了钝化QD表面并保护其免受周围环境的影响，制得了核-壳结构。将SnS纳米颗粒（NPs）浸入CBD浴中以沉积In2S3层。通过离心分离形成的核/壳SnS / In2S3纳米颗粒，并用乙醇洗涤。核壳SnS / In2S3 NPs的结构已通过高分辨率TEM进行了研究，结果显示SnS核的晶格条纹被无定形基质包围，暂时归因于In2S3。 EDX确认预期元素的存在。随着CBD In2S3时间的延长，SnS / In2S3纳米粒子的吸收光谱清楚地显示出带隙增加，这归因于更厚的In2S3壳层。嵌入CIS太阳能电池中的SnS QD的研究正在进行中。

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