TiO2形态对MAPbBr3太阳电池转化效率影响机制的研究

doi:10.15541/jim20170384

无机材料学报 ›› 2018, Vol. 33 ›› Issue (2): 245-250.DOI: 10.15541/jim20170384

所属专题：钙钛矿材料；光伏材料；乘风破浪的新能源材料

• • 上一篇

TiO₂形态对MAPbBr₃太阳电池转化效率影响机制的研究

张敏, 王增华, 郑霄家, 张文华

中国工程物理研究院化工材料研究所, 四川省新材料研究中心, 成都 610200

收稿日期:2017-08-08 修回日期:2017-10-06 出版日期:2018-02-26 网络出版日期:2018-01-26
作者简介:张敏(1987),女,科研助理.E-mail:zhangmzhm@163.com
基金资助:
基金项目: 四川省重点研发项目(2017GZ0052) Key Research and Development Project of Sichuan Province (2017GZ0052)

Structural Effect of TiO₂ on the Performance of MAPbBr₃ Solar Cells

ZHANG Min, WANG Zeng-Hua, ZHENG Xiao-Jia, ZHANG Wen-Hua

Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu 610200, China

Received:2017-08-08 Revised:2017-10-06 Published:2018-02-26 Online:2018-01-26

摘要/Abstract

摘要：

二氧化钛(TiO₂)是钙钛矿太阳电池中最常用的电子传输材料, 研究发现其形态对MAPbBr₃太阳电池的器件转化效率可产生直接影响。研究不同形态TiO₂对钙钛矿太阳电池转化效率的影响机制对进一步认识此类太阳电池的工作机理十分必要。本工作使用旋涂法制备了不同形态的TiO₂, 而后采用反溶剂室温结晶的方法在TiO₂基底上进一步制备MAPbBr₃(MA = CH₃NH₃)薄膜, 并通过X射线光电子能谱(XPS)详细研究了TiO₂与MAPbBr₃接触界面的能级位置关系。研究结果表明: 不同形态的TiO₂ 在与钙钛矿接触后形成的导带差异不同; 不同的导带能级差可直接影响MAPbBr₃钙钛矿电池中电子的传递与收集, 进而影响电池的转化效率。

关键词: 能级位置, XPS, MAPbBr3, 钙钛矿电池

Abstract:

TiO₂ is frequently used as electron transport layer in perovskite solar cells, and its structure can directly affect the performance of MAPbBr₃solar cells. It is necessary to investigate the structural effect of TiO₂ to further understand the working mechanism of such kind solar cells. TiO₂ thin films with different morphology were prepared by spin coating, and MAPbBr₃(MA = CH₃NH₃) thin films were further deposited on it through anti-solvent assisted crystallization approach. Then, energy band alignment between TiO₂ and MAPbBr₃ were characterized by X-ray photoelectron spectroscopy (XPS). According to the experimental results, TiO₂ with different morphology possessed different electronic structures and yield different band alignment after contacting with MAPbBr₃ perovskite layer. The difference of conduction band value between TiO₂ and MAPbBr₃ can directly affect the transport and collection feature of electrons, thereby governing the performance of the photovoltaic device.

Key words: band alignment, XPS, MAPbBr3, perovskite solar cell

中图分类号:

TQ174

张敏, 王增华, 郑霄家, 张文华. TiO₂形态对MAPbBr₃太阳电池转化效率影响机制的研究[J]. 无机材料学报, 2018, 33(2): 245-250.

ZHANG Min, WANG Zeng-Hua, ZHENG Xiao-Jia, ZHANG Wen-Hua. Structural Effect of TiO₂ on the Performance of MAPbBr₃ Solar Cells[J]. Journal of Inorganic Materials, 2018, 33(2): 245-250.

图/表 5

图1 (a)TiO2, (b)MAPbBr3/FTO, (c)致密TiO2上沉积超薄MAPbBr3以及(d)介孔TiO2上沉积超薄MAPbBr3的SEM截面照片

Fig. 1 SEM images for (a) TiO2, (b) MAPbBr3 on FTO, (c) super thin MAPbBr3 on cp TiO2 and (d) super thin MAPbBr3 on mp TiO2

图2 (a) cp TiO2、(b) mp TiO2、(c) MAPbBr3、(d) cp TiO2上沉积超薄MAPbBr3和(e) mp TiO2上沉积超薄MAPbBr3样品的光电子能谱图

Fig. 2 XPS spectra for (a) cp TiO2, (b) mp TiO2, (c) MAPbBr3, (d) thin MAPbBr3 on cp TiO2 and (e) thin MAPbBr3 on mp TiO2

图3 MAPbBr3/TiO2异质结的能级位置关系

Fig. 3 Energy band diagram of MAPbBr3/TiO2 heterointerface obtained from XPS measurements

表1 基于不同电子传输层的MAPbBr3钙钛矿电池光伏性能参数

Table 1 Photovoltaic parameters of MAPbBr3 solar cells with different electron transport layers

Sample	V_oc/V	J_sc/(mA∙cm^-2)	FF/%	η/%
cp TiO₂	0.91	0.34	61.41	0.19
mp TiO₂	1.39	7.13	75.88	7.52

图4 基于不同电子传输层的太阳电池器件性能

Fig. 4 Performance of the solar cells based on different electron transport layers

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TiO₂形态对MAPbBr₃太阳电池转化效率影响机制的研究

Structural Effect of TiO₂ on the Performance of MAPbBr₃ Solar Cells

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