A Switchable High-Sensitivity Photodetecting and Photovoltaic Device with Perovskite Absorber.
Amplified photocurrent gain has been obtained by photodiodes of inorganic semiconductors such as GaAs and Si. The avalanche photodiode, developed for high-sensitivity photodetectors, requires an expensive vapor-phase epitaxy manufacture process and high driving voltage (50-150 V). Here, we show that a low-cost solution-processed device using a planar-structured ferroelectric organo-lead triiodide perovskite enables light detection in a large dynamic range of incident power (10(-7)-10(-1) W cm(-2)) by switching with small voltage (-0.9 to +0.5 V). The device achieves significantly high external quantum conversion efficiency (EQE) up to 2.4 × 10(5)% (gain value of 2400) under weak monochromatic light. On a single dual-functional device, incident small power (0.2-100 μW cm(-2)) and medium to large power (>0.1 mW cm(-2)) are captured by reverse bias and forward bias modes, respectively, with linear responsivity of current. For weak light detection, the device works with a high responsivity value up to 620 A W(-1).
†Graduate School of Engineering, Toin University of Yokohama, Kuroganecho 1614, Aoba, Yokohama, Kanagawa 225-8503, Japan.|§Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
Hsin-Wei
HW
Chen
‡Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
Nobuya
N
Sakai
†Graduate School of Engineering, Toin University of Yokohama, Kuroganecho 1614, Aoba, Yokohama, Kanagawa 225-8503, Japan.
Ajay Kumar
AK
Jena
†Graduate School of Engineering, Toin University of Yokohama, Kuroganecho 1614, Aoba, Yokohama, Kanagawa 225-8503, Japan.
Yoshitaka
Y
Sanehira
†Graduate School of Engineering, Toin University of Yokohama, Kuroganecho 1614, Aoba, Yokohama, Kanagawa 225-8503, Japan.
Masashi
M
Ikegami
§Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
Kuo-Chuan
KC
Ho
†Graduate School of Engineering, Toin University of Yokohama, Kuroganecho 1614, Aoba, Yokohama, Kanagawa 225-8503, Japan.
Tsutomu
T
Miyasaka
amplification; ferroelectricity; perovskite photovoltaic cell; photoconductivity; photodetector