TY - JOUR
T1 - Depolarization electric field and poling voltage-modulated Pb,La(Zr,Ti)O3-based self-powered ultraviolet photodetectors
AU - Zhang, Ying
AU - Chen, Jian
AU - Cai, Yixing
AU - Zhang, Qingfeng
AU - Lu, Yinmei
AU - Huang, Haitao
AU - He, Yunbin
N1 - Funding Information:
This work was supported by the National Key R&D Program of China (Grant No. 2019YFB1503500), the National Natural Science Foundation of China (Grant Nos. 11774082, 51872079), the Natural Science Foundation of Hubei Province (Grant Nos. 2019CFA006, 2019CFA055), the Program for Science and Technology Innovation Team in Colleges of Hubei Province (T201901), Wuhan Application Foundation Frontier Project (No. 2018010401011287), the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU152140/19E), and Shenzhen Science and Technology Innovation Committee (SGDX2019081623240364).
Publisher Copyright:
© 2020 The American Ceramic Society (ACERS)
PY - 2021/2
Y1 - 2021/2
N2 - Traditional self-powered ultraviolet photodetectors, which are usually designed based on p-n junction interfacial effects, exhibit low responsivity and specific detectivity because the photogenerated electrons and holes cannot be separated effectively. Unlike wide band-gap semiconductor materials, ferroelectrics have large remnant polarization and thus high depolarization electric field throughout the whole bulk region, which can cause effective separation of photogenerated electrons and holes. Based on this, in this study, we prepare Pb0.93La0.07(Zr1-xTix)0.9825O3 (PLZT) ferroelectric thin films with large remnant polarization and self-powered ultraviolet photodetectors with Au/PLZT/FTO structure. The results indicate that the photoelectric response performances of the detectors improve as the remnant polarization of the PLZT thin film and positive poling voltage increase. By adjusting the Ti content, due to large remnant polarization of 47.4 μC/cm2 in the PLZT thin films with 80 mol% Ti, the corresponding photodetector exhibits the best self-powered ultraviolet photoelectric response with the high photo/dark current ratio of 2600, responsivity of 2.05 mA/W, specific detectivity of 5.45 × 1010 Jones, and fast response speed (rise time of 18 ms). These values are superior to those of recently reported self-powered ultraviolet photodetectors.
AB - Traditional self-powered ultraviolet photodetectors, which are usually designed based on p-n junction interfacial effects, exhibit low responsivity and specific detectivity because the photogenerated electrons and holes cannot be separated effectively. Unlike wide band-gap semiconductor materials, ferroelectrics have large remnant polarization and thus high depolarization electric field throughout the whole bulk region, which can cause effective separation of photogenerated electrons and holes. Based on this, in this study, we prepare Pb0.93La0.07(Zr1-xTix)0.9825O3 (PLZT) ferroelectric thin films with large remnant polarization and self-powered ultraviolet photodetectors with Au/PLZT/FTO structure. The results indicate that the photoelectric response performances of the detectors improve as the remnant polarization of the PLZT thin film and positive poling voltage increase. By adjusting the Ti content, due to large remnant polarization of 47.4 μC/cm2 in the PLZT thin films with 80 mol% Ti, the corresponding photodetector exhibits the best self-powered ultraviolet photoelectric response with the high photo/dark current ratio of 2600, responsivity of 2.05 mA/W, specific detectivity of 5.45 × 1010 Jones, and fast response speed (rise time of 18 ms). These values are superior to those of recently reported self-powered ultraviolet photodetectors.
UR - http://www.scopus.com/inward/record.url?scp=85097028665&partnerID=8YFLogxK
U2 - 10.1111/jace.17542
DO - 10.1111/jace.17542
M3 - Journal article
AN - SCOPUS:85097028665
SN - 0002-7820
VL - 104
SP - 928
EP - 935
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 2
ER -