Photovoltaic device based on TiO2 rutile/anatase phase junctions fabricated in coaxial nanorod arrays

Pengli Yan; Xiang Wang; Xiaojia Zheng; Rengui Li; Jingfeng Han; Jingying Shi; Ailong Li; Yang Gan; Can Li

doi:10.1016/j.nanoen.2015.05.005

Photovoltaic device based on TiO₂ rutile/anatase phase junctions fabricated in coaxial nanorod arrays

Pengli Yan
, Xiang Wang
, Xiaojia Zheng
, Rengui Li
, Jingfeng Han
, Jingying Shi
, Ailong Li
, Yang Gan^*
, Can Li

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Harbin Institute of Technology
CAS - Dalian Institute of Chemical Physics
University of Chinese Academy of Sciences

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

64 Scopus citations

Abstract

Phase-junctions formed in mixed crystalline phases of semiconductor based photocatalysts (TiO₂ and Ga₂O₃) shows enhanced photocatalytic activity owing to efficient separation of photogenerated charges. However, the phase junction effect on charge separation has not been directly verified yet. In this study, we fabricated a prototype photovoltaic device based on TiO₂ rutile/anatase coaxial nanorod arrays (NRAs) to demonstrate charge separation at the interface of polymorphic crystal phases. The device-FTO/rutile NRAs/anatase/ITO shows an ordinary photovoltaic response (open-circuit voltage V_oc: 154mV, short-circuit current density J_sc: 1.76mA/cm²), contrasting with photo resistor behavior of two TiO₂ single phase devices of core-core (FTO/rutile NRAs/ITO) and shell-shell (FTO/anatase/ITO). Experimental evidences suggest that the built-in electric field at the interface of rutile/anatase phase junctions in the FTO/rutile NRAs/anatase/ITO device provides the direct driving force for efficient separation of photogenerated charges. The demonstrated strategy of fabricating phase-junction photovoltaic devices may inspire further investigations on new device converting solar into electrical energy and highlight the key role of the phase junction interface in the properties of the mix-phase photocatalysts.

Original language	English
Pages (from-to)	406-412
Number of pages	7
Journal	Nano Energy
Volume	15
DOIs	https://doi.org/10.1016/j.nanoen.2015.05.005
State	Published - 1 Jul 2015

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Coaxial nanorod
Phase junction
Prototype PV device
Titania

Access to Document

10.1016/j.nanoen.2015.05.005

Cite this

@article{a3d11b5ee9cc4d019c9c42049159d415,

title = "Photovoltaic device based on TiO2 rutile/anatase phase junctions fabricated in coaxial nanorod arrays",

abstract = "Phase-junctions formed in mixed crystalline phases of semiconductor based photocatalysts (TiO2 and Ga2O3) shows enhanced photocatalytic activity owing to efficient separation of photogenerated charges. However, the phase junction effect on charge separation has not been directly verified yet. In this study, we fabricated a prototype photovoltaic device based on TiO2 rutile/anatase coaxial nanorod arrays (NRAs) to demonstrate charge separation at the interface of polymorphic crystal phases. The device-FTO/rutile NRAs/anatase/ITO shows an ordinary photovoltaic response (open-circuit voltage Voc: 154mV, short-circuit current density Jsc: 1.76mA/cm2), contrasting with photo resistor behavior of two TiO2 single phase devices of core-core (FTO/rutile NRAs/ITO) and shell-shell (FTO/anatase/ITO). Experimental evidences suggest that the built-in electric field at the interface of rutile/anatase phase junctions in the FTO/rutile NRAs/anatase/ITO device provides the direct driving force for efficient separation of photogenerated charges. The demonstrated strategy of fabricating phase-junction photovoltaic devices may inspire further investigations on new device converting solar into electrical energy and highlight the key role of the phase junction interface in the properties of the mix-phase photocatalysts.",

keywords = "Coaxial nanorod, Phase junction, Prototype PV device, Titania",

author = "Pengli Yan and Xiang Wang and Xiaojia Zheng and Rengui Li and Jingfeng Han and Jingying Shi and Ailong Li and Yang Gan and Can Li",

note = "Publisher Copyright: {\textcopyright} 2015.",

year = "2015",

month = jul,

day = "1",

doi = "10.1016/j.nanoen.2015.05.005",

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T1 - Photovoltaic device based on TiO2 rutile/anatase phase junctions fabricated in coaxial nanorod arrays

AU - Yan, Pengli

AU - Wang, Xiang

AU - Zheng, Xiaojia

AU - Li, Rengui

AU - Han, Jingfeng

AU - Shi, Jingying

AU - Li, Ailong

AU - Gan, Yang

AU - Li, Can

PY - 2015/7/1

Y1 - 2015/7/1

N2 - Phase-junctions formed in mixed crystalline phases of semiconductor based photocatalysts (TiO2 and Ga2O3) shows enhanced photocatalytic activity owing to efficient separation of photogenerated charges. However, the phase junction effect on charge separation has not been directly verified yet. In this study, we fabricated a prototype photovoltaic device based on TiO2 rutile/anatase coaxial nanorod arrays (NRAs) to demonstrate charge separation at the interface of polymorphic crystal phases. The device-FTO/rutile NRAs/anatase/ITO shows an ordinary photovoltaic response (open-circuit voltage Voc: 154mV, short-circuit current density Jsc: 1.76mA/cm2), contrasting with photo resistor behavior of two TiO2 single phase devices of core-core (FTO/rutile NRAs/ITO) and shell-shell (FTO/anatase/ITO). Experimental evidences suggest that the built-in electric field at the interface of rutile/anatase phase junctions in the FTO/rutile NRAs/anatase/ITO device provides the direct driving force for efficient separation of photogenerated charges. The demonstrated strategy of fabricating phase-junction photovoltaic devices may inspire further investigations on new device converting solar into electrical energy and highlight the key role of the phase junction interface in the properties of the mix-phase photocatalysts.

AB - Phase-junctions formed in mixed crystalline phases of semiconductor based photocatalysts (TiO2 and Ga2O3) shows enhanced photocatalytic activity owing to efficient separation of photogenerated charges. However, the phase junction effect on charge separation has not been directly verified yet. In this study, we fabricated a prototype photovoltaic device based on TiO2 rutile/anatase coaxial nanorod arrays (NRAs) to demonstrate charge separation at the interface of polymorphic crystal phases. The device-FTO/rutile NRAs/anatase/ITO shows an ordinary photovoltaic response (open-circuit voltage Voc: 154mV, short-circuit current density Jsc: 1.76mA/cm2), contrasting with photo resistor behavior of two TiO2 single phase devices of core-core (FTO/rutile NRAs/ITO) and shell-shell (FTO/anatase/ITO). Experimental evidences suggest that the built-in electric field at the interface of rutile/anatase phase junctions in the FTO/rutile NRAs/anatase/ITO device provides the direct driving force for efficient separation of photogenerated charges. The demonstrated strategy of fabricating phase-junction photovoltaic devices may inspire further investigations on new device converting solar into electrical energy and highlight the key role of the phase junction interface in the properties of the mix-phase photocatalysts.

KW - Coaxial nanorod

KW - Phase junction

KW - Prototype PV device

KW - Titania

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