Carbon Quantum Dots/TiOx Electron Transport Layer Boosts Efficiency of Planar Heterojunction Perovskite Solar Cells to 19%
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- 英文论文题名：Carbon Quantum Dots/TiOx Electron Transport Layer Boosts Efficiency of Planar Heterojunction Perovskite Solar Cells to 19%
- 论文作者：Xiaojuan Zhao ; Hao Li ; Weina Shi ; Yan Shen ; Mingkui Wang
- 英文论文作者：Xiaojuan Zhao ; Hao Li ; Weina Shi ; Yan Shen ; Mingkui Wang ; Wuhan National Laboratory for Optoelectronics ; Huazhong University of Science and Technology
- 年：2017
- 作者机构：Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology;
- 英文论文关键词：Perovskite ; heterojunction ; solar cell ; quantum dots ; electron transport
- 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：569k
- 原文格式：D
- 会议级别：全国
摘要
In planar n-i-p heterojunction perovskite solar cells, the electron transport layer plays important roles in charge extraction and determine the morphology of the perovskite film.Here, we report a solution-processed carbon quantum dots(CQDs)/TiO_2 composite that has negligible absorption in the visible spectral range, a very attractive feature for perovskite solar cells.Using this novel CQDs/TiO_2 ETL in conjunction with a planar n-i-p heterojunction, we achieved an unprecedented efficiency of ~19% under standard illumination test conditions.It was found that a CQDs/TiO_2 combination increases both the open circuit voltage and short-circuits current density as compared to using TiO_2 alone.Various advanced spectroscopic characterizations including ultrafast spectroscopy, ultraviolet photoelectron spectroscopy, and electronic impedance spectroscopy elucidate that the CQDs increases the electronic coupling between the CH_3NH_3PbI_(3-x)Cl_x and TiO_2 ETL interface as well as energy levers that contribute to electron extraction.With optimized CQDs modification contents(10% weight percentage), the planar heterojunction perovskite solar cell devices could achieve power conversion efficiency as high as ~19%.The high performance of such perovskite solar cells can be attributed to the improvement of electron mobility, electron extraction ability, and well-matched energy levers by the adding CQDs, which lead to remarkable increases on JSC and VOC.~([1])
In planar n-i-p heterojunction perovskite solar cells, the electron transport layer plays important roles in charge extraction and determine the morphology of the perovskite film.Here, we report a solution-processed carbon quantum dots(CQDs)/TiO_2 composite that has negligible absorption in the visible spectral range, a very attractive feature for perovskite solar cells.Using this novel CQDs/TiO_2 ETL in conjunction with a planar n-i-p heterojunction, we achieved an unprecedented efficiency of ~19% under standard illumination test conditions.It was found that a CQDs/TiO_2 combination increases both the open circuit voltage and short-circuits current density as compared to using TiO_2 alone.Various advanced spectroscopic characterizations including ultrafast spectroscopy, ultraviolet photoelectron spectroscopy, and electronic impedance spectroscopy elucidate that the CQDs increases the electronic coupling between the CH_3NH_3PbI_(3-x)Cl_x and TiO_2 ETL interface as well as energy levers that contribute to electron extraction.With optimized CQDs modification contents(10% weight percentage), the planar heterojunction perovskite solar cell devices could achieve power conversion efficiency as high as ~19%.The high performance of such perovskite solar cells can be attributed to the improvement of electron mobility, electron extraction ability, and well-matched energy levers by the adding CQDs, which lead to remarkable increases on JSC and VOC.~([1])
In planar n-i-p heterojunction perovskite solar cells, the electron transport layer plays important roles in charge extraction and determine the morphology of the perovskite film.Here, we report a solution-processed carbon quantum dots(CQDs)/TiO_2 composite that has negligible absorption in the visible spectral range, a very attractive feature for perovskite solar cells.Using this novel CQDs/TiO_2 ETL in conjunction with a planar n-i-p heterojunction, we achieved an unprecedented efficiency of ~19% under standard illumination test conditions.It was found that a CQDs/TiO_2 combination increases both the open circuit voltage and short-circuits current density as compared to using TiO_2 alone.Various advanced spectroscopic characterizations including ultrafast spectroscopy, ultraviolet photoelectron spectroscopy, and electronic impedance spectroscopy elucidate that the CQDs increases the electronic coupling between the CH_3NH_3PbI_(3-x)Cl_x and TiO_2 ETL interface as well as energy levers that contribute to electron extraction.With optimized CQDs modification contents(10% weight percentage), the planar heterojunction perovskite solar cell devices could achieve power conversion efficiency as high as ~19%.The high performance of such perovskite solar cells can be attributed to the improvement of electron mobility, electron extraction ability, and well-matched energy levers by the adding CQDs, which lead to remarkable increases on JSC and VOC.~([1])
引文
[1]H.Li,W.Shi,W.Huang,E.-P.Yao,J.Han,Z.Chen,S.Liu,Y.Shen,Y.Yang and M.Wang,Nano Letters,2017,17,2328-2335.