Strong Synergistic Coupling of Four-Components-Blended Interface for Efficient Electron Transfer and Stable Mesoscopic Perovskite Solar Cells:The Key Role of SnO_2
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- 英文论文题名：Strong Synergistic Coupling of Four-Components-Blended Interface for Efficient Electron Transfer and Stable Mesoscopic Perovskite Solar Cells:The Key Role of SnO_2
- 论文作者：Yantao Shi ; Qingshun Dong ; Yanping Lv ; Chunyang Zhang ; Shi Wang ; Yulin Feng ; Caiyun Xue ; Yingying Shao
- 英文论文作者：Yantao Shi ; Qingshun Dong ; Yanping Lv ; Chunyang Zhang ; Shi Wang ; Yulin Feng ; 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：mesoscopic perovskite solar cells ; blended interface ; electron transfer ; tin oxide
- 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：685k
- 原文格式：D
- 会议级别：全国
摘要
Contrary to the traditional double-layer structured electron transfer layer(ETL) applied in mesoscopic perovskite solar cells(M-PSCs), we propose a more rational design of ETL architecture which does not contain a compact TiO_2 underlayer but is based on an interface with strongly coupled four components of FTO, SnO_2, TiO_2, and perovskite.This structure has proved to be more kinetically advantageous for transferring photo-induced electrons.The key to the construction of the proposed ETL is the partial pre-attachment of a spot of SnO_2 nanocrystallites(NCs) on FTO prior to the preparation of the mesoporous TiO_2 scaffold.Subsequently, an interface involving the four components is formed, along with the deposition of perovskite.The interfacial electron transfer dynamics of M-PSCs with three different ETL structures is studied in detail.For M-PSCs with the new ETL, a very strong synergistic interfacial electronic coupling between perovskite and FTO charge transfer is observed and clarified using electrochemical impedance spectra(EIS).In the new ETL, SnO_2 is a key component and is found to be essential to lower series resistance(R_s) and enhance shunt resistance(R_(sh)), which can sufficiently offset the deteriorated dark current as a result of the direct contact between perovskite and FTO.Combined with the new strategy of solvent engineering we developed in the present study for the sequential deposition of high-quality perovskite of CH_3NH_3PbI_3, the M-PSCs with new ETL exhibit lower hysteresis effect and high PCE of 18.16%.These M-PSCs also display a steady-state PCE output of 17.14%, which is much superior to that of M-PSCs with traditional double-layer ETL.In addition, the stability of M-PSCs with the new ETL can be significantly improved, because of the absence of the compact TiO_2 layer which leads to photo-induced interfacial degradation.This study confirms the feasibility and rational of replacing the conventional double-layer ETL in M-PSCs with a new structure that is more advantageous for electron transfer and interfacial stabilization.
Contrary to the traditional double-layer structured electron transfer layer(ETL) applied in mesoscopic perovskite solar cells(M-PSCs), we propose a more rational design of ETL architecture which does not contain a compact TiO_2 underlayer but is based on an interface with strongly coupled four components of FTO, SnO_2, TiO_2, and perovskite.This structure has proved to be more kinetically advantageous for transferring photo-induced electrons.The key to the construction of the proposed ETL is the partial pre-attachment of a spot of SnO_2 nanocrystallites(NCs) on FTO prior to the preparation of the mesoporous TiO_2 scaffold.Subsequently, an interface involving the four components is formed, along with the deposition of perovskite.The interfacial electron transfer dynamics of M-PSCs with three different ETL structures is studied in detail.For M-PSCs with the new ETL, a very strong synergistic interfacial electronic coupling between perovskite and FTO charge transfer is observed and clarified using electrochemical impedance spectra(EIS).In the new ETL, SnO_2 is a key component and is found to be essential to lower series resistance(R_s) and enhance shunt resistance(R_(sh)), which can sufficiently offset the deteriorated dark current as a result of the direct contact between perovskite and FTO.Combined with the new strategy of solvent engineering we developed in the present study for the sequential deposition of high-quality perovskite of CH_3NH_3PbI_3, the M-PSCs with new ETL exhibit lower hysteresis effect and high PCE of 18.16%.These M-PSCs also display a steady-state PCE output of 17.14%, which is much superior to that of M-PSCs with traditional double-layer ETL.In addition, the stability of M-PSCs with the new ETL can be significantly improved, because of the absence of the compact TiO_2 layer which leads to photo-induced interfacial degradation.This study confirms the feasibility and rational of replacing the conventional double-layer ETL in M-PSCs with a new structure that is more advantageous for electron transfer and interfacial stabilization.
Contrary to the traditional double-layer structured electron transfer layer(ETL) applied in mesoscopic perovskite solar cells(M-PSCs), we propose a more rational design of ETL architecture which does not contain a compact TiO_2 underlayer but is based on an interface with strongly coupled four components of FTO, SnO_2, TiO_2, and perovskite.This structure has proved to be more kinetically advantageous for transferring photo-induced electrons.The key to the construction of the proposed ETL is the partial pre-attachment of a spot of SnO_2 nanocrystallites(NCs) on FTO prior to the preparation of the mesoporous TiO_2 scaffold.Subsequently, an interface involving the four components is formed, along with the deposition of perovskite.The interfacial electron transfer dynamics of M-PSCs with three different ETL structures is studied in detail.For M-PSCs with the new ETL, a very strong synergistic interfacial electronic coupling between perovskite and FTO charge transfer is observed and clarified using electrochemical impedance spectra(EIS).In the new ETL, SnO_2 is a key component and is found to be essential to lower series resistance(R_s) and enhance shunt resistance(R_(sh)), which can sufficiently offset the deteriorated dark current as a result of the direct contact between perovskite and FTO.Combined with the new strategy of solvent engineering we developed in the present study for the sequential deposition of high-quality perovskite of CH_3NH_3PbI_3, the M-PSCs with new ETL exhibit lower hysteresis effect and high PCE of 18.16%.These M-PSCs also display a steady-state PCE output of 17.14%, which is much superior to that of M-PSCs with traditional double-layer ETL.In addition, the stability of M-PSCs with the new ETL can be significantly improved, because of the absence of the compact TiO_2 layer which leads to photo-induced interfacial degradation.This study confirms the feasibility and rational of replacing the conventional double-layer ETL in M-PSCs with a new structure that is more advantageous for electron transfer and interfacial stabilization.
引文
[1]A.Guerrero,G.Garcia-Belmonte,I.Mora-Sero,J.Bisquert,Y.S.Kang,J.Jacobsson,JP.Correa-Baena,A.Hagfeldt,J.Phys.Chem.C 2016,120,8023.
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[2]E.J.Juarez-Perez,M.Wuβler,F.Fabregat-Santiago,K.Lakus-Wollny,E.Mankel,T.Mayer,W.Jaegermann,I.Mora-Sero,J.Phys.Chem.Lett.2014,5,680.