Temperature effect of the compact TiO2 layer in planar perovskite solar cells: An interfacial electrical, optical and carrier mobility study

Tao Ye; Jun Xing; Miloš Petrović; Shi Chen; Vijila Chellappan; Gomathy Sandhya Subramanian; Tze Chien Sum; Bin Liu; Qihua Xiong; Seeram Ramakrishna

doi:10.1016/j.solmat.2017.01.005

Temperature effect of the compact TiO₂ layer in planar perovskite solar cells: An interfacial electrical, optical and carrier mobility study

Tao Ye, Jun Xing, Miloš Petrović, Shi Chen, Vijila Chellappan^*, Gomathy Sandhya Subramanian, Tze Chien Sum, Bin Liu, Qihua Xiong, Seeram Ramakrishna

^*Corresponding author for this work

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

38 Citations (Scopus)

Abstract

The power conversion efficiency of TiO₂ based organo-lead halide perovskite solar cells has already surpassed 20% by utilizing low temperature solution processing techniques. However, the electronic structures and exciton/electron transport mechanism at the TiO₂/perovskite interface are not fully understood. In this report, simple planar TiO₂/perovskite heterojunctions are fabricated with different TiO₂ compact layers followed by studies of their effect on the charge extraction/transport properties of the deposited heterojunctions. Efficient perovskite solar cells based on these TiO₂/perovskite heterojunctions [with CH₃NH₃PbI₃ and FA_0.81MA_0.15Pb(I_0.836Br_0.15)₃ films] have been fabricated and the devices exhibit reproducible efficiency values and good stability. The impact of interfacial potential barrier and TiO₂ surface properties on photogenerated carrier transport mechanisms and overall power conversion efficiency of perovskite solar cells is investigated by using comprehensive electrical and optical characterization methods such as SEM, XRD, XPS, Raman spectroscopy, TRPL, TAS and TPD. Obtained results indicate that efficient device can be fabricated by optimizing of TiO₂ annealing conditions.

Original language	English
Pages (from-to)	242-249
Number of pages	8
Journal	Solar Energy Materials and Solar Cells
Volume	163
DOIs	https://doi.org/10.1016/j.solmat.2017.01.005
Publication status	Published - Apr 1 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

Keywords

Carrier transport mechanism
Interfacial potential barrier
Perovskite nests
Perovskite/TiO heterojunctions
Surface states

UN SDGs

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

Access to Document

10.1016/j.solmat.2017.01.005

Cite this

Ye, T., Xing, J., Petrović, M., Chen, S., Chellappan, V., Subramanian, G. S., Sum, T. C., Liu, B., Xiong, Q., & Ramakrishna, S. (2017). Temperature effect of the compact TiO₂ layer in planar perovskite solar cells: An interfacial electrical, optical and carrier mobility study. Solar Energy Materials and Solar Cells, 163, 242-249. https://doi.org/10.1016/j.solmat.2017.01.005

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abstract = "The power conversion efficiency of TiO2 based organo-lead halide perovskite solar cells has already surpassed 20% by utilizing low temperature solution processing techniques. However, the electronic structures and exciton/electron transport mechanism at the TiO2/perovskite interface are not fully understood. In this report, simple planar TiO2/perovskite heterojunctions are fabricated with different TiO2 compact layers followed by studies of their effect on the charge extraction/transport properties of the deposited heterojunctions. Efficient perovskite solar cells based on these TiO2/perovskite heterojunctions [with CH3NH3PbI3 and FA0.81MA0.15Pb(I0.836Br0.15)3 films] have been fabricated and the devices exhibit reproducible efficiency values and good stability. The impact of interfacial potential barrier and TiO2 surface properties on photogenerated carrier transport mechanisms and overall power conversion efficiency of perovskite solar cells is investigated by using comprehensive electrical and optical characterization methods such as SEM, XRD, XPS, Raman spectroscopy, TRPL, TAS and TPD. Obtained results indicate that efficient device can be fabricated by optimizing of TiO2 annealing conditions.",

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Ye, T, Xing, J, Petrović, M, Chen, S, Chellappan, V, Subramanian, GS, Sum, TC, Liu, B, Xiong, Q & Ramakrishna, S 2017, 'Temperature effect of the compact TiO₂ layer in planar perovskite solar cells: An interfacial electrical, optical and carrier mobility study', Solar Energy Materials and Solar Cells, vol. 163, pp. 242-249. https://doi.org/10.1016/j.solmat.2017.01.005

TY - JOUR

T1 - Temperature effect of the compact TiO2 layer in planar perovskite solar cells

T2 - An interfacial electrical, optical and carrier mobility study

AU - Ye, Tao

AU - Xing, Jun

AU - Petrović, Miloš

AU - Chen, Shi

AU - Chellappan, Vijila

AU - Subramanian, Gomathy Sandhya

AU - Sum, Tze Chien

AU - Liu, Bin

AU - Xiong, Qihua

AU - Ramakrishna, Seeram

PY - 2017/4/1

Y1 - 2017/4/1

N2 - The power conversion efficiency of TiO2 based organo-lead halide perovskite solar cells has already surpassed 20% by utilizing low temperature solution processing techniques. However, the electronic structures and exciton/electron transport mechanism at the TiO2/perovskite interface are not fully understood. In this report, simple planar TiO2/perovskite heterojunctions are fabricated with different TiO2 compact layers followed by studies of their effect on the charge extraction/transport properties of the deposited heterojunctions. Efficient perovskite solar cells based on these TiO2/perovskite heterojunctions [with CH3NH3PbI3 and FA0.81MA0.15Pb(I0.836Br0.15)3 films] have been fabricated and the devices exhibit reproducible efficiency values and good stability. The impact of interfacial potential barrier and TiO2 surface properties on photogenerated carrier transport mechanisms and overall power conversion efficiency of perovskite solar cells is investigated by using comprehensive electrical and optical characterization methods such as SEM, XRD, XPS, Raman spectroscopy, TRPL, TAS and TPD. Obtained results indicate that efficient device can be fabricated by optimizing of TiO2 annealing conditions.

AB - The power conversion efficiency of TiO2 based organo-lead halide perovskite solar cells has already surpassed 20% by utilizing low temperature solution processing techniques. However, the electronic structures and exciton/electron transport mechanism at the TiO2/perovskite interface are not fully understood. In this report, simple planar TiO2/perovskite heterojunctions are fabricated with different TiO2 compact layers followed by studies of their effect on the charge extraction/transport properties of the deposited heterojunctions. Efficient perovskite solar cells based on these TiO2/perovskite heterojunctions [with CH3NH3PbI3 and FA0.81MA0.15Pb(I0.836Br0.15)3 films] have been fabricated and the devices exhibit reproducible efficiency values and good stability. The impact of interfacial potential barrier and TiO2 surface properties on photogenerated carrier transport mechanisms and overall power conversion efficiency of perovskite solar cells is investigated by using comprehensive electrical and optical characterization methods such as SEM, XRD, XPS, Raman spectroscopy, TRPL, TAS and TPD. Obtained results indicate that efficient device can be fabricated by optimizing of TiO2 annealing conditions.

KW - Carrier transport mechanism

KW - Interfacial potential barrier

KW - Perovskite nests

KW - Perovskite/TiO heterojunctions

KW - Surface states

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