Planar CH_3NH_3PbI_3 perovskite solar cells applying solution processed Ti-Fe-O ternary oxides as efficient electron extraction layer

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• 英文论文题名：Planar CH_3NH_3PbI_3 perovskite solar cells applying solution processed Ti-Fe-O ternary oxides as efficient electron extraction layer
• 论文作者：Xin Li ; Hong Lin
• 英文论文作者：Xin Li ; Hong Lin ; State Key Laboratory of New Ceramics & Fine Processing ; School of Materials Science and Engineering ; Tsinghua University
• 年：2017
• 作者机构：State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University;
• 英文论文关键词：Planar perovskite solar cells ; Electron extraction layer ; Ti-Fe-O oxides ; Coverage ; Conductivity ; Energy level alignment ; Hysteresis
• 会议召开时间：2017-05-27
• 会议录名称：第四届新型太阳能电池学术研讨会论文集
• 英文会议录名称：Abstract Book of the 4th Conference on New Generation Solar Cells
• 语种：英文
• 分类号：TM914.4
• 学会代码：ZKYQ
• 会议名称：第四届新型太阳能电池学术研讨会
• 会议地点：中国北京
• 主办单位：中国可再生能源学会光化学专业委员会
• 学会名称：中国科学院物理研究所清洁能源实验室
• 页数：1
• 文件大小：458k
• 原文格式：D
• 会议级别：全国

摘要

Electron extraction layer(EEL) as one of the most important component in organometal–halide perovskites solar cells(PSCs) has attracted considerable research efforts on both materials and its interface with the light-harvesting perovskite.In this study, Ti-Fe-O ternary oxides were incorporated into the planar-structured PSCs based on CH_3NH_3PbI_3 as the EELs compared with conventional TiO_x compact layer and pure FeO_x compact layer.It shows that for the Ti-Fe-O oxides, with the increase of the Fe content from 0%mol to 100%mol, the conductivities and energy levels of the thin films present relative changes.With the incorporation of Fe, the conduction bands get lower compared with pure TiO_x which is proved by X-ray photoelectron spectroscopy(XPS) and UV-Vis spectroscopy.Additionally, the conductivity is significantly improved according to the conductive atomic force microscopy(CAFM) and linear sweep voltammetry(LSV) measurement.As a result, the oxides with higher Fe content give better electron extractions according to the photoluminescence(PL) spectroscopies measured in both steady and transient state.On the contrary, more narrow energy gap due to higher Fe ratio would result in short-wavelengthlight loss and lower open circuit voltage(V_(OC)).Consequently, Ti_(0.5)Fe_(0.5)O_x with the optimal Ti-Fe ratio of 1:1 gives the highest power conversion efficiency(PCE) up to 14.7% higher than pure TiO_x and FeO_x with reasonable short circuit current(JSC), V_(OC) and highly reduced hysteresis.
Electron extraction layer(EEL) as one of the most important component in organometal–halide perovskites solar cells(PSCs) has attracted considerable research efforts on both materials and its interface with the light-harvesting perovskite.In this study, Ti-Fe-O ternary oxides were incorporated into the planar-structured PSCs based on CH_3NH_3PbI_3 as the EELs compared with conventional TiO_x compact layer and pure FeO_x compact layer.It shows that for the Ti-Fe-O oxides, with the increase of the Fe content from 0%mol to 100%mol, the conductivities and energy levels of the thin films present relative changes.With the incorporation of Fe, the conduction bands get lower compared with pure TiO_x which is proved by X-ray photoelectron spectroscopy(XPS) and UV-Vis spectroscopy.Additionally, the conductivity is significantly improved according to the conductive atomic force microscopy(CAFM) and linear sweep voltammetry(LSV) measurement.As a result, the oxides with higher Fe content give better electron extractions according to the photoluminescence(PL) spectroscopies measured in both steady and transient state.On the contrary, more narrow energy gap due to higher Fe ratio would result in short-wavelengthlight loss and lower open circuit voltage(V_(OC)).Consequently, Ti_(0.5)Fe_(0.5)O_x with the optimal Ti-Fe ratio of 1:1 gives the highest power conversion efficiency(PCE) up to 14.7% higher than pure TiO_x and FeO_x with reasonable short circuit current(J_(SC)), V_(OC) and highly reduced hysteresis.

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