ZnO纳米管有序阵列与Cu2O纳米晶核壳结构的光电化学性能及全固态纳米结构太阳电池研究

doi:10.7503/cjcu20130425

摘要/Abstract

摘要：

采用电化学方法在铟锡氧化物(ITO)导电玻璃基底上制备了高度有序的ZnO纳米管阵列, 然后在ZnO纳米管阵列上电化学沉积Cu₂O纳米晶颗粒, 获得了一维有序Cu₂O/ZnO核壳式纳米阵列结构, 通过控制Cu₂O纳米晶的沉积电量得到不同厚度的Cu₂O壳层, 并对该核壳式纳米阵列的形貌和结构进行了分析. 以Cu₂O/ZnO一维核壳式纳米阵列结构为光电极组装全固态纳米结构太阳电池, 研究了Cu₂O壳层厚度对光电极光吸收性能、光电性能以及组装电池光伏性能的影响, 优化了电池中对电极材料的喷金厚度. 结果表明, 以Cu₂O沉积电量为1.5 C的Cu₂O/ZnO为光活性层, 以4 mA电流下真空镀金20~25 min的铜基底为对电极组装的简易太阳电池最高可获得0.013%的光电转换效率.

关键词: ZnO纳米管阵列, Cu2O纳米晶, 核壳式结构, 全固态纳米结构太阳电池

Abstract:

Highly ordered ZnO nanotube arrays were prepared on the indium-tin oxide(ITO) glass substrate by a electrochemical method. Sequently, Cu₂O nanocrystals were electrodeposited onto the walls of the ZnO nanotube arrays to form the designed Cu₂O/ZnO 1D core-shell nanostructure. Cu₂O shell of different thickness was obtained by controlling the deposition coulomb of the Cu₂O nanocrystals. Scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD) were used to characterize the samples to confirm the formation of the designed nanostructures. A solid state solar cell with the designed Cu₂O/ZnO nanostructure as photoelectrode was fabricated. The effects of the Cu₂O shell thickness on the absorption and photoelectrochemical properties of the photoeletrode, as well as the photovoltaic performance of the designed solar cell, were investigated. The Au film thickness of the opposite electrode was also optimized. An energy conversion efficiency of 0.013% was obtained with the solar cell based on the photoelectrode of Cu₂O(1.5 C)/ZnO and the opposite electrode of Au(20—25 min, 4 mA)/Cu.

Key words: ZnO nanotube array, Cu2O nanocrystal, Core-shell structure, All oxide solid state nanostructure solar cell

中图分类号:

O644

TrendMD:

郝彦忠, 孙宝, 罗冲, 范龙雪, 裴娟, 李英品. ZnO纳米管有序阵列与Cu₂O纳米晶核壳结构的光电化学性能及全固态纳米结构太阳电池研究. 高等学校化学学报, 2014, 35(1): 127.

HAO Yanzhong, SUN Bao, LUO Chong, FAN Longxue, PEI Juan, LI Yingpin. Photoelectrochemistry of Core-shell Nanostructure of Ordered ZnO Nanotube Array and Cu₂O Nanocrystals and Performance of the All Oxide Solid State Nanostructure Solar Cell^†. Chem. J. Chinese Universities, 2014, 35(1): 127.

图/表 12

Fig.1 SEM images of the ZnO nanotube array(A) Top view, inset is the magnified image; (B) cross-sectional view.

Fig.2 SEM images of the 1D Cu2O/ZnO core-shell nanostructureInsets are the magnified images. The deposited coulombs for the Cu2O nanocrystals: (A) 0.5 C, (B) 1.0 C, (C) 1.5 C.

Fig.3 HRTEM images of the Cu2O(1.0 C)/ZnO core-shell nanostructure

Fig.4 XRD pattern of the Cu2O(1.0 C)/ZnO core-shell nanostructure

Fig.5 UV-Vis diffuse reflection spectra of different electrodesa. ZnO nanotube array; b—d. Cu2O(0.5, 1.0, 1.5 C)/ZnOcore-shell nanostructures, respectively.

Fig.6 Transient photocurrent spectra of different electrodes(A) ZnO nanotube array(0.2 V, SCE); (B)—(D) Cu2O(0.5, 1.0, 1.5 C)/ZnO nanostructures(-0.2 V, SCE), respectively.

Fig.7 Current density-potential linear scanning curves of the Cu2O(1.0 C)/ZnO nanostructure electrode under dark condition(a) and 490 nm illumination(b)

Fig.8 Current density-voltage(J-V) curves for solar cells based on different photoelectrodesa. Cu2O(0.5 C)/ZnO; b. Cu2O(1.0 C)/ZnO; c. Cu2O(1.5 C)/ZnO; d. Cu2O(2.0 C)/ZnO.

Table 1 Photovoltaic properties for different solar cells based on different photoelectrodes

Photoelectrode	J_sc/(mA·cm^-2)	V_oc/V	FF^*	η(%)
Cu₂O(0.5 C)/ZnO	0.081	0.054	0.27	0.001
Cu₂O(1.0 C)/ZnO	0.255	0.083	0.28	0.006
Cu₂O(1.5 C)/ZnO	0.391	0.112	0.29	0.013
Cu₂O(2.0 C)/ZnO	0.422	0.103	0.28	0.012

Fig.9 Current density-voltage(J-V) curves for solar cells based on different counter electrodesa. Cu; b. Au(5 min)/Cu; c. Au(10 min)/Cu; d. Au(15 min)/Cu; e. Au(20 min)/Cu; f. Au(25 min)/Cu.

Table 2 Photovoltaic properties for different solar cells based on different counter electrodes

Counter electrode	J_sc/(mA·cm^-2)	V_oc/V	FF	η(%)
Cu	0.078	0.060	0.24	0.001
Au(5 min)/Cu	0.104	0.080	0.29	0.002
Au(10 min)/Cu	0.275	0.101	0.28	0.008
Au(15 min)/Cu	0.346	0.106	0.28	0.010
Au(20 min)/Cu	0.391	0.112	0.29	0.013
Au(25 min)/Cu	0.419	0.108	0.28	0.013

Fig.10 Charge-transfer processes for the Cu2O/ZnO core-shell nanostructure

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ZnO纳米管有序阵列与Cu₂O纳米晶核壳结构的光电化学性能及全固态纳米结构太阳电池研究

Photoelectrochemistry of Core-shell Nanostructure of Ordered ZnO Nanotube Array and Cu₂O Nanocrystals and Performance of the All Oxide Solid State Nanostructure Solar Cell^†

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