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Greatly enhanced photocurrent in inorganic perovskite [KNbO 3 ] 0.9 [BaNi 0.5 Nb 0.5 O 3‐σ ] 0.1 ferroelectric thin‐film solar cell
Author(s) -
Chen Jian,
Pei Weijie,
Chen Guang,
Zhang Qingfeng,
Lu Yinmei,
Huang Haitao,
Li Mingkai,
He Yunbin
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15890
Subject(s) - poling , materials science , photocurrent , perovskite (structure) , ferroelectricity , optoelectronics , schottky barrier , band gap , open circuit voltage , thin film , polarization (electrochemistry) , schottky diode , short circuit , nanotechnology , voltage , dielectric , electrical engineering , crystallography , chemistry , diode , engineering
Inorganic perovskite [KNbO 3 ] 0.9 [BaNi 0.5 Nb 0.5 O 3‐σ ] 0.1 (KBNNO) ferroelectric thin films with narrow band gap (1.83 eV) and high room‐temperature remnant polarization (Pr = 0.54 μC/cm 2 ) was grown successfully on the Pt(111)/Ti/SiO 2 /Si(100) substrates by pulsed laser deposition. Ferroelectric solar cells with a basic structure of ITO/KBNNO/Pt were further prepared based on these thin films, which exhibited obvious external‐poling dependent photovoltaic effects. When the devices were negatively poled, the short‐circuit current and open‐circuit voltage were both significantly higher than those of the devices poled positively. This is attributed to enhanced charge separation under the depolarization field induced by the negative poling, which is superimposed with the built‐in field induced by the Schottky barriers at the interfaces between KBNNO and the two electrodes. When a poling voltage of ‐1 V was applied, the device showed a short‐circuit current as high as 27.3 μA/cm 2 , which was by two orders of magnitude larger than that of the KBNNO thick‐film (20 μm) devices reported previously. This work may inspire further exploration for lead‐free inorganic perovskite ferroelectric photovoltaic devices.