npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2012; 62: 894-899

Published online August 31, 2012

Copyright © New Physics: Sae Mulli.

Photocurrent Characteristics of Ferroelectric Pb(Zr0.3Ti0.7)O3 Thin Films with Pt and ITO top electrodes

Pt와 ITO 상부전극에 따른 강유전체 Pb(Zr0.3Ti0.7)O3 박막의 광전류 특성

Sung Sik WON, Chang Won AHN, Ill Won KIM*

Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 680-749



In materials without a center of symmetry, such as ferroelectric materials, photocurrent can be produced in a homogeneous medium under uniform illumination, which is called the ferroelectric photovoltaic effect (FPE). We have fabricated Pb(Zr0.3Ti0.7)O3 (PZT) ferroelectric thin films with Pt and ITO electrodes on Pt/Ti/SiO2/Si substrates by using a sol-gel technique and investigated the photocurrent behaviors. The photocurrent of the Pt/PZT/Pt capacitor, which depended on the direction of polarization, exhibited a symmetric behavior, but that of the ITO/PZT/Pt capacitor, which also depended on the direction of polarization, exhibited an asymmetric behavior. The effects of the difference between the top electrode materials on the photocurrent behaviers of the Pt/PZT/Pt and ITO/PZT/Pt capacitors are discussed.

Keywords: Ferroelectric, Photovoltaic, Photocurrent, Thin Film, PZT, Ferroelectric Photovoltaic

결정구조 상 대칭중심을 가지지 않는 강유전 물질에 빛이 입사되면 광전류가 발생되는데 이 현상을 강유전체 광기전력 효과 (ferroelectric photovoltaic effect, FPE)라 한다. 졸-겔 방법으로 Pt/Ti/SiO2/Si 기판 위에 Pb(Zr0.3Ti0.7)O3 (PZT) 강유전체 박막을 제조 후 서로 다른 Pt와 ITO 상부전극을 사용하여 광전류 특성을 조사하였다. 분극 방향에 따른 Pt/PZT/Pt 캐패시터의 광전류는 대칭적이었으나 ITO/PZT/Pt 캐패시터의 광전류는 비대칭적이었다. 상부전극 물질 차이에 따른 Pt/PZT/Pt와 ITO/PZT/Pt 캐패시터의 광전류 특성 변화에 관하여 논의하였다.

Keywords: 강유전체, 광기전력 효과, 광전류, PZT, 박막, 강유전체 광기전력

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