Tunable photovoltaic effects in transparent Pb(Zr0.53,Ti0.47)O3 capacitors

Abstract

We report an investigation on optical, ferroelectric, and photovoltaic properties of transparent Sn-doped In2O3 (ITO)/Pb(Zr0.53,Ti0.47)O3 (PZT)/ITO thin film capacitors. The ferroelectric PZT sandwiched structures grown on glass substrates exhibit a transmittance of 65% in the visible light range. The current-voltage characteristics show that the transparent PZT capacitors possess a significant photovoltaic response under a light illumination. Moreover, the photovoltaic response can be well tuned by an external electrical field, which can be understood by considering the tunable depolarized field in the PZT capacitors.

Ultra-thin platinum interfacial layer assisted-photovoltaic response of transparent Pb(Zr,Ti)O3 thin film capacitors

“…1(b). The obtained P r value of the ITO/PZT/Pt (5 nm)/ITO capacitor is high in comparison with the reported value for polycrystalline PZT films -in the range of 18-30 lC/ cm 2 (Qin et al, 2009b;Harshan and Kotru, 2012;Chen et al, 2012;Zheng et al, 2008). The other two capacitors À ITO/PZT/ITO without the Pt layer and ITO/PZT/Pt (2 nm)/ITO -exhibit typical leaky characteristics of a round P-V loop without any saturation of P at high V, as shown in Fig.…”

Arising applications of ferroelectric materials in photovoltaic devices

“…It was also suggested that the anomalous photovoltage should be closely related to the degree of screening of the spontaneous polarization. 35,[72][73][74] The screening charge distribution depends on both the properties of ferroelectric materials and the metal or semiconductor, such as the remnant polarization, the free charge density and the dielectric constant. Meanwhile the impact of the incomplete screening on the depolarization eld depends on the thickness of the ferroelectric layer: a smaller thickness of the ferroelectric layer results in a larger depolarization eld.…”

“…They observed a gradually decreased photovoltage output from 0.4 V to 0.1 V and attributed it to a reduced depolarization eld in the PZT lm caused by different remnant polarizations. 73,74 The tunable screening effect provides opportunities to verify if the depolarization eld has a critical contribution to the APV. However, the relationship of the depolarization eld and the photovoltage output in the previous reports were not clearly revealed due to the presence of some other mechanism such as different built-in potential or changed remnant polarization.…”

Transparent Photovoltaic Device using Two-dimensional Transition-metal Dichalcogenides

“…특히 투명성을 갖는 태양전지의 경우 건물 외관에 부착되거나 발광 소자에 부착되어 버려지는 광 에너지를 이용하여 전력을 발생시키는 energy harvesting device로 응용 될 수 있는 가능성이 있 어서 산화물 반도체 [5]나 고분자 반도체 소재 [6], 또 는 nano-wire [7]등을 이용하여 투명 태양전지를 제 작하는 연구가 진행되었다. 하지만, photon을 흡수 하여 electron-hole pair를 형성시켜 기전력을 발생 시키는 태양전지의 기본 원리 때문에 투명한 태양 전지는 가시광 영역의 빛을 발전에 사용하기가 어 려워 대부분의 연구 결과는 자외선이나 적외선 영 역에서 동작하는 태양전지를 제작하는데 집중되었 다.…”