PbS量子点/ZnO纳米片复合膜的制备及其光电化学性能

doi:10.3724/SP.J.1077.2012.00059

无机材料学报 ›› 2012, Vol. 27 ›› Issue (1): 59-63.DOI: 10.3724/SP.J.1077.2012.00059

PbS量子点/ZnO纳米片复合膜的制备及其光电化学性能

廖鑫¹, 杨峰¹, 蒲明华¹, 赵勇^{1, 2}, 程翠华²

(1. 西南交通大学超导与新能源研究开发中心, 材料先进技术教育部重点实验室, 成都610031; 2. 新南威尔士大学材料科学与工程学院, 悉尼2052)

收稿日期:2011-04-02 修回日期:2011-05-12 出版日期:2012-01-09 网络出版日期:2011-12-19
作者简介:廖鑫(1978-), 男, 硕士研究生. E-mail: liaoxin112q@163.com
基金资助:
国家自然科学基金(50588201, 50872116);中央高校基本科研业务费专项基金(2009QK46, SWJTU09ZT24);国家863计划(2007AA03Z203);高等学校博士点专项科研基金(SRFDP200806130023);长江学者与创新团队计划(IRT0751)

PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance

LIAO Xin¹, YANG Feng¹, PU Ming-Hua¹, ZHAO Yong^1,2, CHENG Cui-Hua^1,2

(1. Superconductivity and New Energy R&D Center (SRDC), Key Laboratory of Advanced Technology of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China; 2. School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia)

Received:2011-04-02 Revised:2011-05-12 Published:2012-01-09 Online:2011-12-19
Supported by:
National Natural Science Foundation of China (50588201, 50872116);Fundamental Research Funds for the Central Universities (2009QK46, SWJTU09ZT24);National High-tech R&D Program of China (863 Program) (2007AA03Z203);Research Fund for the Doctoral Program of Higher Education of China (SRFDP200806130023);the PCSIRT of the Ministry of Education of China (IRT0751)

摘要/Abstract

摘要：

通过两步法合成PbS量子点(QDs)修饰ZnO纳米片复合膜. 首先利用电化学法在掺氟的SnO₂导电玻璃(FTO)上生长ZnO纳米片, 然后在ZnO纳米片上通过逐次化学浴法沉积PbS量子点形成PbS/ZnO复合膜. 利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)详细表征了样品的表面形貌和晶体结构, 并研究了PbS/ZnO复合膜作为量子点敏化太阳能电池光阳极的紫外-可见吸收谱、光电化学性能和表面光电压谱. 对比ZnO纳米片经PbS量子点修饰前后, 发现PbS量子点修饰后光阳极的光吸收和光伏响应均从紫外区拓宽到了可见光区, 同时光电化学性能有了显著提高, 短路电流密度从敏化前的0.1 mA/cm²增加到0.7 mA/cm², 效率由0.04%增加到0.57%. 与单一ZnO纳米片相比, PbS/ZnO复合膜的表面光伏响应强度明显增强, 说明PbS与ZnO之间形成了有利于光生电荷分离的异质结, 从而导致了PbS/ZnO复合膜光电性能的增加.

关键词: ZnO纳米片, PbS量子点, 量子点敏化太阳能电池

Abstract:

PbS quantum dots(QDs)/ZnO nanosheets composite films were synthesized via a two-step method. ZnO nanosheet films were firstly grown on fluorine-doped SnO₂ conducting glass(FTO) by electrodeposition techniques, then PbS QDs were decorated on ZnO nanosheets to form composite films by sequential chemical bath deposition. The morphology and crystalline phase of obtained films were detailedly characterized by scanning electron microscope (SEM), X-ray diffraction (XRD). The UV-Vis absorption, photoelectrochemical and surface photovoltage properties of ZnO nanosheets and PbS QDs/ZnO nanosheets composite films were investigated respectively. The results show that the absorption and surface photovoltage response region of PbS QDs/ZnO nanosheets composite films are more abroad than that of pristine ZnO nanosheets, extended from UV to visible light region. The photoelectrochemical property of PbS QDs/ZnO nanosheets composite films is dramatically enhanced compared to non-decorated ZnO nanosheets films, from 0.1 to 0.7 mA/cm² of short circuit current density (J_sc), from 0.04% to 0.57% of convert efficiency. Compared with ZnO nanosheets, the surface photovoltage response intensity is enhanced in PbS QDs/ZnO nanosheets, indicating heterojunction formed between PbS and ZnO. Photo-generated charge can effectively separate through this heterojunction, that is the reason for enhancement in photoelectric properties of PbS QDs/ZnO nanosheets composite films.

Key words: ZnO nanosheets, PbS quantum dots, quantum dots sensitized solar cells

中图分类号:

TQ174

廖鑫, 杨峰, 蒲明华, 赵勇, 程翠华. PbS量子点/ZnO纳米片复合膜的制备及其光电化学性能[J]. 无机材料学报, 2012, 27(1): 59-63.

LIAO Xin, YANG Feng, PU Ming-Hua, ZHAO Yong, CHENG Cui-Hua. PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance[J]. Journal of Inorganic Materials, 2012, 27(1): 59-63.

图/表 5

图1 ZnO纳米片的XRD图谱

Fig. 1 XRD patterns of as-prepared ZnO nanosheets

图2 ZnO纳米片的SEM照片

Fig. 2 SEM images of ZnO nanosheets

图3 PbS量子点修饰ZnO纳米片前后的紫外-可见吸收光谱

Fig. 3 UV-visible spectra of ZnO nanosheets

图4 PbS量子点修饰ZnO纳米片前后的I-V曲线

Fig. 4 I-V curves of ZnO nanosheets

图5 PbS量子点修饰ZnO纳米片前后的表面光电压谱

Fig. 5 Surface photovoltage spectra of ZnO nanosheets

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PbS量子点/ZnO纳米片复合膜的制备及其光电化学性能

PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance

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