PheOptimizing optical and electrical properties of Cu-doped MoO3 thin films for photodiode applications

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-09-18 DOI:10.1016/j.optmat.2025.117536

M. Ataei, M.R. Fadavieslam

引用次数: 0

Abstract

In this study, MoO3:Cu thin films with varying Cu concentrations (0, 3, 6, 9 wt%) were deposited on p-type Si using spray pyrolysis to fabricate p-n junction diodes. XRD analysis showed increased crystallinity and grain size with Cu doping up to 6 wt%. FESEM images revealed heterogeneous rectangular particles, while AFM indicated increasing surface roughness with higher Cu concentrations. The grain sizes were 181, 183, 184, and 119 nm for 0, 3, 6, and 9 wt%, respectively. EDX confirmed the elemental composition without impurities. Optical characterization showed the bandgap narrowing from 2.89 to 2.56 eV, with the minimum at 6 wt% Cu. PL spectra displayed a red shift in emission, indicating changes in defect concentration. J-V measurements demonstrated a reduction in the ideality factor (n = 3.13) and barrier height (Φb = 0.65) at 6 wt%, leading to improved diode characteristics, enhanced photoresponse, and faster response times.

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光电二极管用掺铜MoO3薄膜的光学和电学性能优化

在本研究中，采用喷雾热解方法在p型Si上沉积不同Cu浓度（0、3、6、9 wt%）的MoO3:Cu薄膜，制备p-n结二极管。XRD分析表明，当Cu掺杂量达到6 wt%时，结晶度和晶粒尺寸均有所提高。FESEM图像显示非均匀的矩形颗粒，而AFM显示随着Cu浓度的增加，表面粗糙度增加。在0、3、6和9 wt%的条件下，晶粒尺寸分别为181、183、184和119 nm。EDX证实元素组成无杂质。光学表征表明，带隙从2.89 eV缩小到2.56 eV，最小带隙为6 wt% Cu。PL光谱显示出发射红移，表明缺陷浓度发生了变化。J-V测量表明，理想系数（n = 3.13）和势垒高度（Φb = 0.65）在6 wt%时降低，从而改善了二极管特性，增强了光响应，并缩短了响应时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.