Direct Evidence of Ion Diffusion for the Silver-Electrode-Induced Thermal Degradation of Inverted Perovskite Solar Cells
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- 英文论文题名：Direct Evidence of Ion Diffusion for the Silver-Electrode-Induced Thermal Degradation of Inverted Perovskite Solar Cells
- 论文作者：Jiangwei Li ; Qingshun Dong ; Nan Li ; Zhengyang Bin ; Lian Duan ; Liduo Wang
- 英文论文作者：Jiangwei Li ; Qingshun Dong ; Nan Li ; Zhengyang Bin ; Lian Duan ; Liduo Wang ; Department of Chemistry ; Tsinghua University
- 年：2017
- 作者机构：Department of Chemistry, Tsinghua University;
- 英文论文关键词：ion diffusion ; silver electrode ; thermal stability ; inverted perovskite solar cells
- 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：714k
- 原文格式：D
- 会议级别：全国
摘要
Perovskite solar cells(PSCs) have attracted great attention in recent years.And FTO/NiO/perovskite/PCBM/Ag(inverted PSCs) is one of the widely used architectures.We have designed and synthesized a series of n-type dopants to increase the conductivity and mobility of PCBM.With an extremely low doping ratio, the PCE of PSCs have improved from 16.6% to 18.1%.~([1]) However, the thermal stability of PSCs is still a major challenge for commercialization.We thoroughly investigated the thermal degradation process of the inverted structured PSCs induced by the silver electrode.Elemental depth profiles indicate that iodide and methylammonium ions diffuse through the electron-trasnporting layer and accumulate at the Ag inner surface.The driving force of forming AgI then facilitates the ions extraction.Variations on the morphology and current mapping of the MAPbI_3 thin films upon thermal treatment reveal that the loss of ions occurs at the grain boundaries and leads to the reconstruction of grain domains.Consequently, the deteriorated MAPbI_3 thin film, the poor electron extraction, and the generation of AgI barrier result in the degradation of efficiencies.These direct evidences provide in-depth understanding of the effect of thermal stress on the devices, offering both experimental support and theoretical guidance for the improvement on the thermal stability of the inverted PSCs.~([2])
Perovskite solar cells(PSCs) have attracted great attention in recent years.And FTO/NiO/perovskite/PCBM/Ag(inverted PSCs) is one of the widely used architectures.We have designed and synthesized a series of n-type dopants to increase the conductivity and mobility of PCBM.With an extremely low doping ratio, the PCE of PSCs have improved from 16.6% to 18.1%.~([1]) However, the thermal stability of PSCs is still a major challenge for commercialization.We thoroughly investigated the thermal degradation process of the inverted structured PSCs induced by the silver electrode.Elemental depth profiles indicate that iodide and methylammonium ions diffuse through the electron-trasnporting layer and accumulate at the Ag inner surface.The driving force of forming AgI then facilitates the ions extraction.Variations on the morphology and current mapping of the MAPbI_3 thin films upon thermal treatment reveal that the loss of ions occurs at the grain boundaries and leads to the reconstruction of grain domains.Consequently, the deteriorated MAPbI_3 thin film, the poor electron extraction, and the generation of AgI barrier result in the degradation of efficiencies.These direct evidences provide in-depth understanding of the effect of thermal stress on the devices, offering both experimental support and theoretical guidance for the improvement on the thermal stability of the inverted PSCs.~([2])
Perovskite solar cells(PSCs) have attracted great attention in recent years.And FTO/NiO/perovskite/PCBM/Ag(inverted PSCs) is one of the widely used architectures.We have designed and synthesized a series of n-type dopants to increase the conductivity and mobility of PCBM.With an extremely low doping ratio, the PCE of PSCs have improved from 16.6% to 18.1%.~([1]) However, the thermal stability of PSCs is still a major challenge for commercialization.We thoroughly investigated the thermal degradation process of the inverted structured PSCs induced by the silver electrode.Elemental depth profiles indicate that iodide and methylammonium ions diffuse through the electron-trasnporting layer and accumulate at the Ag inner surface.The driving force of forming AgI then facilitates the ions extraction.Variations on the morphology and current mapping of the MAPbI_3 thin films upon thermal treatment reveal that the loss of ions occurs at the grain boundaries and leads to the reconstruction of grain domains.Consequently, the deteriorated MAPbI_3 thin film, the poor electron extraction, and the generation of AgI barrier result in the degradation of efficiencies.These direct evidences provide in-depth understanding of the effect of thermal stress on the devices, offering both experimental support and theoretical guidance for the improvement on the thermal stability of the inverted PSCs.~([2])
引文
[1]Z.Bin,J.Li,L.Wang,L.Duan,Energy Environ.Sci.2016,9,3424.
[2]J.Li,Q.Dong,N.Li,L.Wang,Adv.Energy Mater.2017,1602922.
[2]J.Li,Q.Dong,N.Li,L.Wang,Adv.Energy Mater.2017,1602922.