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Title: Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element

Abstract

Perovskite rare-earth nickelates (RNiO3) have attracted much attention because of their exotic physical properties and rich potential applications. Here, we report systematic tuning of the electronic structures of RNiO3 (R=Nd, Sm, Gd, and Lu) by isovalent A-site substitution. By integrating RNiO3 thin films with Nb-doped SrTiO3 (NSTO), p-n heterojunction photovoltaic cells have been prepared and their performance has been investigated. The open-circuit voltage increases monotonically with decreasing A-site cation radius of RNiO3. This change results in a downward shift of the Fermi level and induces the increase in the built-in potential at the RNiO3/NSTO heterojunction, with LuNiO3/NSTO showing the largest open-circuit voltage. At the same time, the short-circuit current initially increases upon changing the A-site element from Nd to Sm. However, the larger bandgaps of GdNiO3 and LuNiO3 reduces light absorption which in turn induces a decrease in the short-circuit current. A power conversion efficiency of 1.13% has been achieved by inserting an ultrathin insulating SrTiO3 layer at the SmNiO3/NSTO interface. Our study illustrates how changing the A-site cation is an effective strategy for tuning photovoltaic performance and increasing the applicability of nickelates in optoelectric devices.

Authors:
 [1];  [2];  [1];  [2];  [1];  [3];  [1];  [3]; ORCiD logo [2];  [1]
  1. Nanyang Technological University
  2. BATTELLE (PACIFIC NW LAB)
  3. Chinese Academy of Sciences
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1530821
Report Number(s):
PNNL-SA-140637
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ACS Applied Materials & Interfaces
Additional Journal Information:
Journal Volume: 11; Journal Issue: 17
Country of Publication:
United States
Language:
English
Subject:
Nickelates, Oxygen vacancy, photovoltaics, p-n heterojunction

Citation Formats

Chang, Lei, Wang, Le, You, Lu, Yang, Zhenzhong, Abdelsamie, Amr, Zhang, Qinghua, Zhou, Yang, Gu, Lin, Chambers, Scott A., and Wang, Junling. Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element. United States: N. p., 2019. Web. doi:10.1021/acsami.9b01851.
Chang, Lei, Wang, Le, You, Lu, Yang, Zhenzhong, Abdelsamie, Amr, Zhang, Qinghua, Zhou, Yang, Gu, Lin, Chambers, Scott A., & Wang, Junling. Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element. United States. doi:10.1021/acsami.9b01851.
Chang, Lei, Wang, Le, You, Lu, Yang, Zhenzhong, Abdelsamie, Amr, Zhang, Qinghua, Zhou, Yang, Gu, Lin, Chambers, Scott A., and Wang, Junling. Wed . "Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element". United States. doi:10.1021/acsami.9b01851.
@article{osti_1530821,
title = {Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element},
author = {Chang, Lei and Wang, Le and You, Lu and Yang, Zhenzhong and Abdelsamie, Amr and Zhang, Qinghua and Zhou, Yang and Gu, Lin and Chambers, Scott A. and Wang, Junling},
abstractNote = {Perovskite rare-earth nickelates (RNiO3) have attracted much attention because of their exotic physical properties and rich potential applications. Here, we report systematic tuning of the electronic structures of RNiO3 (R=Nd, Sm, Gd, and Lu) by isovalent A-site substitution. By integrating RNiO3 thin films with Nb-doped SrTiO3 (NSTO), p-n heterojunction photovoltaic cells have been prepared and their performance has been investigated. The open-circuit voltage increases monotonically with decreasing A-site cation radius of RNiO3. This change results in a downward shift of the Fermi level and induces the increase in the built-in potential at the RNiO3/NSTO heterojunction, with LuNiO3/NSTO showing the largest open-circuit voltage. At the same time, the short-circuit current initially increases upon changing the A-site element from Nd to Sm. However, the larger bandgaps of GdNiO3 and LuNiO3 reduces light absorption which in turn induces a decrease in the short-circuit current. A power conversion efficiency of 1.13% has been achieved by inserting an ultrathin insulating SrTiO3 layer at the SmNiO3/NSTO interface. Our study illustrates how changing the A-site cation is an effective strategy for tuning photovoltaic performance and increasing the applicability of nickelates in optoelectric devices.},
doi = {10.1021/acsami.9b01851},
journal = {ACS Applied Materials & Interfaces},
number = 17,
volume = 11,
place = {United States},
year = {2019},
month = {5}
}