Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction

Low-temperature solution-processed CH3NH3PbI3 interfaced with TiO2 has recently been demonstrated as a highly successful type-II light harvesting heterojunction with ≈20% efficiency. Therefore, an efficient ultrafast photoexcited electron transfer from CH3NH3PbI3 to TiO2 is expected. However, by pro...

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Main Authors: Xing, Guichuan, Wu, Bo, Chen, Shi, Chua, Julianto, Yantara, Natalia, Mhaisalkar, Subodh, Mathews, Nripan, Sum, Tze Chien
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/103724
http://hdl.handle.net/10220/25825
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1037242021-01-10T10:43:11Z Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction Xing, Guichuan Wu, Bo Chen, Shi Chua, Julianto Yantara, Natalia Mhaisalkar, Subodh Mathews, Nripan Sum, Tze Chien School of Materials Science & Engineering School of Physical and Mathematical Sciences Energy Research Institute @ NTU (ERI@N) DRNTU::Engineering::Materials Low-temperature solution-processed CH3NH3PbI3 interfaced with TiO2 has recently been demonstrated as a highly successful type-II light harvesting heterojunction with ≈20% efficiency. Therefore, an efficient ultrafast photoexcited electron transfer from CH3NH3PbI3 to TiO2 is expected. However, by probing the photoexcited charge carrier dynamics in CH3NH3PbI3/quartz, CH3NH3PbI3/TiO2 (compact), and CH3NH3PbI3/PCBM in a comparative study, an electron transfer potential barrier between CH3NH3PbI3 and the compact TiO2 (prepared with the spray pyrolysis method) formed by surface states is uncovered. Consequently, the CH3NH3PbI3 photoluminescence intensity and lifetime is enhanced when interfaced to compact TiO2. The electron accumulation within CH3NH3PbI3 needed to overcome this interfacial potential barrier results in the undesirable large current–voltage hysteresis observed for CH3NH3PbI3/TiO2 planar heterojunctions. The findings in this study indicate that careful surface engineering to reduce this potential barrier is key to pushing perovskite solar cell efficiencies toward the theoretical limit. 2015-06-08T04:08:39Z 2019-12-06T21:18:52Z 2015-06-08T04:08:39Z 2019-12-06T21:18:52Z 2015 2015 Journal Article Xing, G., Wu, B., Chen, S., Chua, J., Yantara, N., Mhaisalkar, S., et al. (2015). Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction. Small, 11(29), 3603-3613. https://hdl.handle.net/10356/103724 http://hdl.handle.net/10220/25825 10.1002/smll.201403719 186926 en Small © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Xing, Guichuan
Wu, Bo
Chen, Shi
Chua, Julianto
Yantara, Natalia
Mhaisalkar, Subodh
Mathews, Nripan
Sum, Tze Chien
Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
description Low-temperature solution-processed CH3NH3PbI3 interfaced with TiO2 has recently been demonstrated as a highly successful type-II light harvesting heterojunction with ≈20% efficiency. Therefore, an efficient ultrafast photoexcited electron transfer from CH3NH3PbI3 to TiO2 is expected. However, by probing the photoexcited charge carrier dynamics in CH3NH3PbI3/quartz, CH3NH3PbI3/TiO2 (compact), and CH3NH3PbI3/PCBM in a comparative study, an electron transfer potential barrier between CH3NH3PbI3 and the compact TiO2 (prepared with the spray pyrolysis method) formed by surface states is uncovered. Consequently, the CH3NH3PbI3 photoluminescence intensity and lifetime is enhanced when interfaced to compact TiO2. The electron accumulation within CH3NH3PbI3 needed to overcome this interfacial potential barrier results in the undesirable large current–voltage hysteresis observed for CH3NH3PbI3/TiO2 planar heterojunctions. The findings in this study indicate that careful surface engineering to reduce this potential barrier is key to pushing perovskite solar cell efficiencies toward the theoretical limit.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Xing, Guichuan
Wu, Bo
Chen, Shi
Chua, Julianto
Yantara, Natalia
Mhaisalkar, Subodh
Mathews, Nripan
Sum, Tze Chien
format Article
author Xing, Guichuan
Wu, Bo
Chen, Shi
Chua, Julianto
Yantara, Natalia
Mhaisalkar, Subodh
Mathews, Nripan
Sum, Tze Chien
author_sort Xing, Guichuan
title Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
title_short Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
title_full Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
title_fullStr Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
title_full_unstemmed Interfacial electron transfer barrier at compact TiO2/CH3NH3PbI3 heterojunction
title_sort interfacial electron transfer barrier at compact tio2/ch3nh3pbi3 heterojunction
publishDate 2015
url https://hdl.handle.net/10356/103724
http://hdl.handle.net/10220/25825
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