Thermal Degradation of Two-Dimensional Perovskite
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- 英文论文题名：Thermal Degradation of Two-Dimensional Perovskite
- 论文作者：Yantao Shi ; Yanping Lv ; Caiyun Xue ; Yingying Shao
- 英文论文作者：Yantao Shi ; Yanping Lv ; Caiyun Xue ; Yingying Shao ; State Key laboratory of Fine Chemicals ; School of Chemistry ; Dalian University of Technology
- 年：2017
- 作者机构：State Key laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology;
- 英文论文关键词：perovskite ; stability ; (MA)2Pb(SCN)2I2 ; thermal degradation
- 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：TB32
- 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：456k
- 原文格式：D
- 会议级别：全国
摘要
(MA)_2Pb(SCN)_2I_2, a new two-dimensional(2D) perovskite material, was reported as a promising candidate to solve the stability issues that the 3D perovskite is facing now.But the stability of MA_2Pb(SCN)_2I_2 was found controversial in later researches.Probing the degradation mechanism is critical to understand the factors on the stability of perovskite.In this work, the thermal degradation mechanism of(MA)_2Pb(SCN)_2I_2 was revealed by in-situ X-ray diffraction(XRD) and coupled thermogravimetry–mass spectrometry analysis.The decomposition of(MA)_2Pb(SCN)_2I_2 has been proved experimentally to be more sophisticated than MAPbI_3, involving four stages and multi-reactions from room temperature to above 500 ℃.First, a reversible process of solid phase separation without any weight loss can be observed in the first stage below 100 ℃.The thermal decomposition of solid compounds with gas evolution occurs in second stage between 100 ℃ and 200 ℃ as two thiocyanates of CH_3SCN and HSCN arise, resulting in ~ 20.5% weight loss as a consequence.Degradations take place extensively in the third and fourth stages, which correspond to the decomposition of MAPbI_3 and sublimation of two lead salts of PbI_2 and Pb(SCN)_2, respectively.Based on experimental results and theoretical calculations, the degradation pathways in each stage have been revealed in-detail, which confirms that the 2D(MA)_2Pb(SCN)_2I_2 actually is not stable when serving as photo-absorber in PSCs.Meanwhile, our work offers clear interpretation why SCN-can hardly be maintained in 3D perovskite.
(MA)_2Pb(SCN)_2I_2, a new two-dimensional(2D) perovskite material, was reported as a promising candidate to solve the stability issues that the 3D perovskite is facing now.But the stability of MA_2Pb(SCN)_2I_2 was found controversial in later researches.Probing the degradation mechanism is critical to understand the factors on the stability of perovskite.In this work, the thermal degradation mechanism of(MA)_2Pb(SCN)_2I_2 was revealed by in-situ X-ray diffraction(XRD) and coupled thermogravimetry–mass spectrometry analysis.The decomposition of(MA)_2Pb(SCN)_2I_2 has been proved experimentally to be more sophisticated than MAPbI_3, involving four stages and multi-reactions from room temperature to above 500 ℃.First, a reversible process of solid phase separation without any weight loss can be observed in the first stage below 100 ℃.The thermal decomposition of solid compounds with gas evolution occurs in second stage between 100 ℃ and 200 ℃ as two thiocyanates of CH_3SCN and HSCN arise, resulting in ~ 20.5% weight loss as a consequence.Degradations take place extensively in the third and fourth stages, which correspond to the decomposition of MAPbI_3 and sublimation of two lead salts of PbI_2 and Pb(SCN)_2, respectively.Based on experimental results and theoretical calculations, the degradation pathways in each stage have been revealed in-detail, which confirms that the 2D(MA)_2Pb(SCN)_2I_2 actually is not stable when serving as photo-absorber in PSCs.Meanwhile, our work offers clear interpretation why SCN-can hardly be maintained in 3D perovskite.
(MA)_2Pb(SCN)_2I_2, a new two-dimensional(2D) perovskite material, was reported as a promising candidate to solve the stability issues that the 3D perovskite is facing now.But the stability of MA_2Pb(SCN)_2I_2 was found controversial in later researches.Probing the degradation mechanism is critical to understand the factors on the stability of perovskite.In this work, the thermal degradation mechanism of(MA)_2Pb(SCN)_2I_2 was revealed by in-situ X-ray diffraction(XRD) and coupled thermogravimetry–mass spectrometry analysis.The decomposition of(MA)_2Pb(SCN)_2I_2 has been proved experimentally to be more sophisticated than MAPbI_3, involving four stages and multi-reactions from room temperature to above 500 ℃.First, a reversible process of solid phase separation without any weight loss can be observed in the first stage below 100 ℃.The thermal decomposition of solid compounds with gas evolution occurs in second stage between 100 ℃ and 200 ℃ as two thiocyanates of CH_3SCN and HSCN arise, resulting in ~ 20.5% weight loss as a consequence.Degradations take place extensively in the third and fourth stages, which correspond to the decomposition of MAPbI_3 and sublimation of two lead salts of PbI_2 and Pb(SCN)_2, respectively.Based on experimental results and theoretical calculations, the degradation pathways in each stage have been revealed in-detail, which confirms that the 2D(MA)_2Pb(SCN)_2I_2 actually is not stable when serving as photo-absorber in PSCs.Meanwhile, our work offers clear interpretation why SCN-can hardly be maintained in 3D perovskite.
引文
[1]Jiang Q,Rebollar D,Gong J,et al.Angewandte Chemie,2015,127(26):7727-7730.
[2]Umeyama D,Lin Y,Karunadasa H I.Chemistry of Materials,2016,28(10):3241-3244.
[3]Juarez-Perez E J,Hawash Z,Raga S R,et al.Energy&Environmental Science,2016,9(11):3406-3410.
[2]Umeyama D,Lin Y,Karunadasa H I.Chemistry of Materials,2016,28(10):3241-3244.
[3]Juarez-Perez E J,Hawash Z,Raga S R,et al.Energy&Environmental Science,2016,9(11):3406-3410.