Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations

Yixuan Dou; Hengxing Xu; Yongtao Liu; Miaosheng Wang; Jia Zhang; Olga S. Ovchinnikova; Bin Hu

doi:10.1016/j.orgel.2020.105671

Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations

Yixuan Dou, Hengxing Xu, Yongtao Liu, Miaosheng Wang, Jia Zhang, Olga S. Ovchinnikova, Bin Hu

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

11 Scopus citations

Abstract

The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B₀ is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm² to 22.60 mA/cm² and 23.08 mA/cm² when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.

Original language	English
Article number	105671
Journal	Organic Electronics
Volume	81
DOIs	https://doi.org/10.1016/j.orgel.2020.105671
State	Published - Jun 2020
Externally published	Yes

Funding

This research was supported by the financial supports from Air Force Office of Scientific Research (AFOSR) under the grant number FA 9550-15-1-0064 , AOARD ( FA2386-15-1-4104 ), and National Science Foundation ( NSF-1911659 ). This research was partially conducted at the Center for Nanophase Materials Sciences based on user projects (CNMS2016-279, CNMS2016-R45, CNMS-2019-057), which is a U.S. Department of Energy Office of Science User Facility . The author (Y-X Dou) acknowledges the financial support from the China Scholarship Council through university agreement for her Ph.D study at the University of Tennessee (Knoxville). This research was supported by the financial supports from Air Force Office of Scientific Research (AFOSR) under the grant number FA 9550-15-1-0064, AOARD (FA2386-15-1-4104), and National Science Foundation (NSF-1911659). This research was partially conducted at the Center for Nanophase Materials Sciences based on user projects (CNMS2016-279, CNMS2016-R45, CNMS-2019-057), which is a U.S. Department of Energy Office of Science User Facility. The author (Y-X Dou) acknowledges the financial support from the China Scholarship Council through university agreement for her Ph.D study at the University of Tennessee (Knoxville).

Funders	Funder number
National Science Foundation	CNMS-2019-057, 1911659, CNMS2016-279, NSF-1911659, CNMS2016-R45
U.S. Department of Energy
Air Force Office of Scientific Research	FA2386-15-1-4104, FA 9550-15-1-0064
University of Tennessee
China Scholarship Council

Keywords

Organic cation
Perovskites
Photocurrent
Solar cells
Spin-orbit coupling

UN SDGs

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

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10.1016/j.orgel.2020.105671

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title = "Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations",

abstract = "The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B0 is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm2 to 22.60 mA/cm2 and 23.08 mA/cm2 when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.",

keywords = "Organic cation, Perovskites, Photocurrent, Solar cells, Spin-orbit coupling",

author = "Yixuan Dou and Hengxing Xu and Yongtao Liu and Miaosheng Wang and Jia Zhang and Ovchinnikova, {Olga S.} and Bin Hu",

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doi = "10.1016/j.orgel.2020.105671",

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AU - Dou, Yixuan

AU - Xu, Hengxing

AU - Liu, Yongtao

AU - Wang, Miaosheng

AU - Zhang, Jia

AU - Ovchinnikova, Olga S.

AU - Hu, Bin

PY - 2020/6

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N2 - The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B0 is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm2 to 22.60 mA/cm2 and 23.08 mA/cm2 when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.

AB - The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B0 is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm2 to 22.60 mA/cm2 and 23.08 mA/cm2 when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.

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Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations

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Funding

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UN SDGs

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