N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%

Wei Chen; Yongqiang Shi; Yang Wang; Xiyuan Feng; Aleksandra B. Djurišić; Han Young Woo; Xugang Guo; Zhubing He

doi:10.1016/j.nanoen.2019.104363

N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%

Wei Chen, Yongqiang Shi, Yang Wang, Xiyuan Feng, Aleksandra B. Djurišić, Han Young Woo, Xugang Guo, Zhubing He

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.

Original language	English
Article number	104363
Journal	Nano Energy
Volume	68
DOIs	https://doi.org/10.1016/j.nanoen.2019.104363
Publication status	Published - 2020 Feb

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20180504165709042). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work.

Funding Information:
This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076 ), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302 ) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864 , JCYJ20170818141216288 , JCYJ20180504165709042 ). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Appendix A

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Electron transport materials
Inverted perovskite solar cell
Long-term stability
N-type conjugated polymer

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Materials Science(all)
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nanoen.2019.104363

Cite this

@article{977b92383bc0421da1913aad8ff56f3b,

title = "N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%",

abstract = "Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.",

keywords = "Electron transport materials, Inverted perovskite solar cell, Long-term stability, N-type conjugated polymer",

author = "Wei Chen and Yongqiang Shi and Yang Wang and Xiyuan Feng and Djuri{\v s}i{\'c}, {Aleksandra B.} and Woo, {Han Young} and Xugang Guo and Zhubing He",

note = "Funding Information: This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20180504165709042). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Funding Information: This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076 ), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302 ) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864 , JCYJ20170818141216288 , JCYJ20180504165709042 ). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Appendix A Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2020",

month = feb,

doi = "10.1016/j.nanoen.2019.104363",

language = "English",

volume = "68",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier BV",

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T1 - N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%

AU - Chen, Wei

AU - Shi, Yongqiang

AU - Wang, Yang

AU - Feng, Xiyuan

AU - Djurišić, Aleksandra B.

AU - Woo, Han Young

AU - Guo, Xugang

AU - He, Zhubing

N1 - Funding Information: This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20180504165709042). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Funding Information: This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076 ), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302 ) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864 , JCYJ20170818141216288 , JCYJ20180504165709042 ). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Appendix A Publisher Copyright: © 2019 Elsevier Ltd

PY - 2020/2

Y1 - 2020/2

N2 - Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.

AB - Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.

KW - Electron transport materials

KW - Inverted perovskite solar cell

KW - Long-term stability

KW - N-type conjugated polymer

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DO - 10.1016/j.nanoen.2019.104363

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VL - 68

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ER -

N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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