氧气氛烧结电极对染料敏化太阳电池微观性能影响机理研究

doi:10.6023/A13020196

化学学报 ›› 2013, Vol. 71 ›› Issue (08): 1149-1153.DOI: 10.6023/A13020196 上一篇下一篇

研究论文

氧气氛烧结电极对染料敏化太阳电池微观性能影响机理研究

寇东星^a,b, 刘伟庆^a, 胡林华^a, 陈双宏^a, 黄阳^a, 戴松元^a

a 中国科学院新型薄膜太阳电池重点实验室中科院等离子体物理研究所合肥 230031;
b 河南大学特种功能材料重点实验室开封 475004

投稿日期:2013-02-18 发布日期:2013-07-19
通讯作者: 戴松元, E-mail: sydai@ipp.ac.cn E-mail:sydai@ipp.ac.cn
基金资助:
项目受国家重点基础研究发展计划(No. 2011CBA00700)、国家高技术研究发展计划(No. 2011AA050527)、国家自然科学基金(Nos. 21003130, 21173228)、中国博士后科学基金(Nos. 20110490835, 2012T50581)资助.

Influence of O₂ Annealed Electrode on Microcosmic Performances in Dye-sensitized Solar Cells

Kou Dongxing^a,b, Liu Weiqing^a, Hu Linhua^a, Chen Shuanghong^a, Huang Yang^a, Dai Songyuan^a

a Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031;
b Key Laboratory For Special Functional Materials, Henan University, Kaifeng 475004

Received:2013-02-18 Published:2013-07-19
Supported by:
Project supported by the National Basic Research Program of China (No. 2011CBA00700), the National High Technology Research and Development Program of China (No. 2011AA050527), the National Natural Science Foundation of China (Nos. 21003130, 21173228) and the China Postdoctoral Science Foundation (Nos. 20110490835, 2012T50581).

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摘要/Abstract

为了改善染料敏化太阳电池内电子的传输复合过程, 研究者尝试不同方法制备或改性TiO₂薄膜. 不同烧结气氛可以改变TiO₂薄膜的表面特性, 是一种有效的方法并被广泛研究. 采用两步烧结法制备氧气氛烧结TiO₂电极并应用于染料敏化太阳电池:第一步将电极在空气或氧气氛中510℃保温30 min以清除TiO₂薄膜中有机物; 第二步将电极进一步在氮气氛中510℃保温10 min以移除电极表面吸附的多余氧原子. 通过与空气烧结电池宏观性能及微观性能的对比, 细致研究了氧气氛烧结电极表面特性对染料敏化太阳电池传输复合微观动力学过程的影响机制. TiO₂薄膜表面特性及带边移动、电子传输复合过程的表征分别借助XPS能谱仪和强度调制光电流谱(IMPS)/强度调制光电压谱(IMVS)等探测技术完成. 结果表明, 氧气烧结电极Ti³⁺复合中心减少, 使电池内部电子复合得到有效抑制. 同时, 氧气烧结电极染料吸附量增加且导带边正移, 使得光生电子浓度升高, 膜内电子传输过程加快. 最终, 氧气烧结电极有效改善了电池光吸收效率、电子收集效率以及注入效率, 使电池效率由6.90%提升至7.53%.

关键词: 染料敏化, 太阳电池, 烧结气氛, 电子传输复合

Over the last decade, different techniques had been employed to prepare nanoporous TiO₂ electrode, aiming to improve the electron transport and depress electron recombination processes in dye-sensitized solar cells (DSCs). Preparing TiO₂ films by various atmospheres and annealing processes was an effective method to change their surface properties. Many results had been published recently regarding the effect of annealing atmospheres on cell performances, but there is no detailed study disclosing the working mechanism of O₂ annealed electrode so far. In the present work, the influence of O₂ anneal electrode on charge transport and recombination processes in dye-sensitized solar cells (DSCs) was investigated. TiO₂films were prepared by a two-step annealing process. The 1st-step of annealing was performed in air or oxygen at 510℃ for 30 min which effectively removed the residual organics originated from the TiO₂ precursor pastes. The 2nd-step of annealing was performed in nitrogen at 510℃ for 10 min which removed extra oxygen atoms resulted from the incorporation of oxygen atoms adsorbed onto photoanode surface during the 1st-step of annealing. Series resistance and fill factor (FF) of the cell can be improved by the 2nd-step. The surface properties of sintering films were characterized by X-ray photoelectron spectroscopy analysis (XPS). The microcosmic processes of recombination, transport and band edge movement were detected by intensity-modulated photocurrent spectroscopy (IMPS)/intensity-modulated photovoltage spectroscopy (IMVS). It was found that both open-circuit photovoltage (V_oc) and short-circuit photocurrent (J_sc) were improved by O₂ annealed electrode. O₂ anneal could reduce the recombination centers of Ti³⁺defects and the recombination between electron and was consequently depressed. Additionally, the electron transport process in TiO₂ films was also improved due to the increase of dye absorption amount and more positive band shift by O₂ anneal. Overall, O₂ annealed electrode enhanced the light absorption efficiency, electron collection efficiency and injection efficiency, inducing the cell efficiency rose from 6.90% to 7.53%.

Key words: dye-sensitized, solar cells, anneal atmospheres, electron transport and recombination

引用此文

寇东星, 刘伟庆, 胡林华, 陈双宏, 黄阳, 戴松元. 氧气氛烧结电极对染料敏化太阳电池微观性能影响机理研究[J]. 化学学报, 2013, 71(08): 1149-1153.

Kou Dongxing, Liu Weiqing, Hu Linhua, Chen Shuanghong, Huang Yang, Dai Songyuan. Influence of O₂ Annealed Electrode on Microcosmic Performances in Dye-sensitized Solar Cells[J]. Acta Chimica Sinica, 2013, 71(08): 1149-1153.

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氧气氛烧结电极对染料敏化太阳电池微观性能影响机理研究

Influence of O₂ Annealed Electrode on Microcosmic Performances in Dye-sensitized Solar Cells

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氧气氛烧结电极对染料敏化太阳电池微观性能影响机理研究

Influence of O2 Annealed Electrode on Microcosmic Performances in Dye-sensitized Solar Cells

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Influence of O₂ Annealed Electrode on Microcosmic Performances in Dye-sensitized Solar Cells