掺钇 α-Fe2O3 纳米棒可增强光电特性并提高光电流密度

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Physics of the Solid State Pub Date : 2024-05-13 DOI:10.1134/S1063783424600407
Lotfi Derbali, Asma Alkabsh, Feriel Bouhjar, Nesrine Zahi
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摘要

摘要 赤铁矿(α-Fe2O3)尽管扩散长度短、电导率极低,但已受到广泛关注,并有可能应用于储能和光伏太阳能电池等多种领域。元素掺杂是增强其结构和光电特性的一种可行策略。在这项工作中,我们报告了通过简单、低成本的水热法成功制备出 α-Fe2O3 纳米棒薄膜的过程,以及掺杂钇元素的关键作用。我们通过改变钇的含量 1、3、5 和 8%,分析了掺杂钇对 α-Fe2O3 的影响。光学研究表明,掺杂钇降低了光带隙,纯赤铁矿钕铁硼薄膜的光带隙为 2.11 eV,而掺杂 5%钇的钕铁硼薄膜的光带隙为 1.94 eV。光致发光研究证明,掺杂 Y 明显降低了 α-Fe2O3 中的重组活动。在所有不同 Y 掺杂浓度的掺杂 α-Fe2O3 NRs 薄膜中,5% 的 Y 掺杂表现出最佳的结构和光电特性,具有最高的光电流密度和入射光子电流效率(IPCE)。在 0.4 V 对 (Ag/AgCl) 电压下,Y 含量为 5% 的掺杂 NR 的光电流密度从 0.25(未掺杂)增加到 1.25 mA/cm2,是原始 α-Fe2O3 所测得的光电流密度的 5 倍。掺 Y NRs 在可见光范围内的高光响应表明,生长出来的 NRs 薄膜是光电应用的绝佳候选材料,尤其是在太阳能电池和大型光收集装置中。
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Yttrium Doped α-Fe2O3 Nanorods for Enhanced Optoelectronic Properties and Increased Photocurrent Density

Hematite (α-Fe2O3) has received a lot of attention and has potential use in a variety of applications such as energy storage and photovoltaic solar cells despite its short diffusion length and extremely low conductivity. A possible strategy to enhance its structural and optoelectronic properties is element doping. In this work, we report on the successful preparation of α-Fe2O3 nanorods thin film via a simple low-cost hydrothermal process, and the crucial effect of yttrium doping. We analyzed the effects of Y-doping of α-Fe2O3 by varying the amount of yttrium 1, 3, 5, and 8 at %. The optical study revealed that Y-doping reduces the optical band gap, with a shift from 2.11 eV for pure hematite NRs films to 1.94 eV for 5 at % Y-doped NRs. Our study proved that Y-doping obviously reduced the recombination activities in α-Fe2O3 as demonstrated by the photoluminescence study. Amongst all doped α-Fe2O3 NRs films with different Y dopant concentration, the 5 at % exhibited best structural and optoelectronic properties with the highest photocurrent density and incident photon to current efficiency (IPCE). The photocurrent density was increased from 0.25 (undoped) to 1.25 mA/cm2 in the doped NRs with 5 at % Y content at 0.4 V vs. (Ag/AgCl) under illumination, which is 5 times higher than that measured in the pristine α-Fe2O3. The high photo-response of Y-doped NRs in the visible range suggests that the grown NRs thin films are excellent candidates for optoelectronic applications, particularly in solar cells and large light-harvesting devices.

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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
期刊介绍: Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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