Kumar Mahesh, Saravanan Adhimoorthy, Chen Sheng-Chi, Huang Bohr-Ran, Sun Hui
Graduate Institute of Electro-Optical Engineering and Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Department of Materials Engineering and Center for Plasma and Thin Film Technologies, Ming Chi University of Technology, New Taipei City 243, Taiwan.
ACS Appl Mater Interfaces. 2025 Jun 18;17(24):35683-35694. doi: 10.1021/acsami.5c02944. Epub 2025 May 13.
Although the novel photovoltaic effects exhibited by ferroelectric materials have been applied for harnessing solar energy, the wide bandgaps often lead to low power conversion efficiencies, below 0.5%, as they absorb only 8-20% of the solar spectrum. In addition to harvesting solar energy, these ferroelectric materials have shown promise for photodetector applications, particularly for sensing near-UV irradiation. This study presents a novel self-powered broadband photodetector based on BaTiO thin film. The device, fabricated to incorporate the pyroelectric effect into the heterojunction, achieved responsivities and detectivities of 1.35, 0.91, 0.12, and 0.08 mA/W, as well as 2.25 × 10, 0.04 × 10, 0.003 × 10, and 0.002 × 10 Jones, respectively, at 365, 456, 532, and 632 nm, respectively, which surpass the performance reported for any other 4-stage pyroelectric-effect-based self-powered BaTiO-based photodetector. The device also exhibited high photosensitivities of 7161%, 21900%, 3183%, and 1346% at the corresponding wavelengths at 0 V. By utilizing the light-induced coupled photovoltaic-pyroelectric effect, the photodetector obtained a remarkable enhancement in the responsivity and detectivity of over 2091%, in contrast to the photovoltaic effect. In addition, the photocurrent response caused by the photovoltaic-pyroelectric effect is thoroughly defined, and the impacts of light wavelength, power intensity, and bias voltage are explored. This study presents a promising strategy to increase the photocurrent of ferroelectric-based photodetectors, paving the way for advancements in their adoption in various optoelectronic devices for industrial and innovative applications.
尽管铁电材料展现出的新型光伏效应已被用于太阳能采集，但由于其宽带隙仅吸收8 - 20%的太阳光谱，往往导致低功率转换效率，低于0.5%。除了采集太阳能外，这些铁电材料在光电探测器应用方面也显示出前景，特别是用于近紫外辐射传感。本研究提出了一种基于BaTiO薄膜的新型自供电宽带光电探测器。该器件通过将热释电效应纳入异质结制成，在365、456、532和632 nm处分别实现了1.35、0.91、0.12和0.08 mA/W的响应度以及2.25×10、0.04×10、0.003×10和0.002×10琼斯的探测率，超过了其他任何基于四阶段热释电效应的自供电BaTiO基光电探测器所报道的性能。该器件在0 V时，在相应波长处还展现出7161%、21900%、3183%和1346%的高光敏度。通过利用光诱导耦合光伏 - 热释电效应，与光伏效应相比，该光电探测器的响应度和探测率显著提高了2091%以上。此外，还全面定义了由光伏 - 热释电效应引起的光电流响应，并探讨了光波长、功率强度和偏置电压的影响。本研究提出了一种增加铁电基光电探测器光电流的有前景策略，为其在各种工业和创新应用的光电器件中的应用推进铺平了道路。
