Enhancement of electrical properties by CuS–PVP nanocomposite on the ZnO/polymer heterojunction

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-06-04 DOI:10.1002/jccs.202400044

Bandhna Verma, Jehova Jire L. Hmar, H. C. Swart, Vinay Kumar

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Abstract

A nanocomposite matrix of covellite–polyvinylpyrrolidone (CuS–PVP) was synthesized through a solution processing method and applied via spin coating onto hydrothermally grown zinc oxide (ZnO) nanorods. Characterization techniques, including X-ray powder diffraction and scanning electron microscopy, confirmed the successful decoration of chain-like CuS–PVP polymer composites onto hexagonal ZnO nanorods. The UV-vis spectroscopy revealed an absorption peak at 372 nm, indicating excitonic absorption of ZnO, and a reduction in the band gap from 3.11 to 2.59 eV upon CuS–PVP polymer decoration, enhancing light harvesting efficiency. Photoluminescence spectra demonstrated the lowest charge carrier recombination rate in the ZnO/CuS–PVP sample, promoting efficient charge separation and transportation, supported by Fourier-transform infrared analysis indicating chemical bonding. Subsequently, the impact of CuS–PVP as an insertion layer in the ZnO/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) inorganic–organic heterojunction was investigated. Favorable band alignment between ZnO, CuS–PVP, and PEDOT:PSS improved conduction, increasing current from 0.3394 to 1.14 mA for D2 (poly-ethyleneterephthalate/Indium tin oxide/ZnO/PEDOT:PSS/Al) and D1 (poly-ethyleneterephthalate/Indium tin oxide/ZnO/CuS–PVP/PEDOT:PSS/Al) at a +2 V bias. Transient photo-responses (J–t) at 0 V bias revealed decreased rise and fall times from 0.382 and 1.154 s to 0.301 and 0.229 s for D2 and D1 devices, respectively. This novel approach provides control over charge carrier transport characteristics at the interface, potentially benefiting self-powered photo-detection in optoelectronic devices.

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氧化锌/聚合物异质结上的 CuS-PVP 纳米复合材料可增强电学特性

通过溶液加工方法合成了一种钴蛭石-聚乙烯吡咯烷酮（CuS-PVP）纳米复合基质，并通过旋涂将其涂在水热法生长的氧化锌（ZnO）纳米棒上。包括 X 射线粉末衍射和扫描电子显微镜在内的表征技术证实，链状 CuS-PVP 聚合物成功地装饰到了六方氧化锌纳米棒上。紫外-可见光谱显示，在 372 纳米处有一个吸收峰，表明 ZnO 有激发吸收，CuS-PVP 聚合物装饰后，带隙从 3.11 eV 减小到 2.59 eV，从而提高了光收集效率。光致发光光谱显示，ZnO/CuS-PVP 样品的电荷载流子重组率最低，从而促进了电荷分离和传输的效率。随后，研究了 CuS-PVP 作为插入层对 ZnO/聚（3,4-乙烯二氧噻吩）-聚（苯乙烯磺酸）（PEDOT:PSS）无机-有机异质结的影响。氧化锌、CuS-PVP 和 PEDOT:PSS 之间的有利带排列改善了传导，在 +2 V 偏置下，D2（聚对苯二甲酸乙二醇酯/氧化铟锡/氧化锌/PEDOT:PSS/Al）和 D1（聚对苯二甲酸乙二醇酯/氧化铟锡/氧化锌/CuS-PVP/PEDOT:PSS/Al）的电流从 0.3394 mA 增加到 1.14 mA。在 0 V 偏置下的瞬态光响应（J-t）显示，D2 和 D1 器件的上升和下降时间分别从 0.382 秒和 1.154 秒缩短到 0.301 秒和 0.229 秒。这种新方法提供了对界面上电荷载流子传输特性的控制，可能有利于光电器件中的自供电光检测。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.