Highly transparent (Transmittance &gt;90%), solution-processed thin films of CuO with a direct bandgap of 3.87 eV were first time utilized for solar blind photo-detection. The CuO thin-film-based photodetector has shown very large DUV/Vis. rejection ratio of ∼5430. The device has shown photo-responsivity value of 7.77 AW -1 and photo-detectivity of 3.08× 1011 cm · Hz 1/2W · 1. Interestingly, the device has shown persistent photoconductivity with a retention time of several days. In order to use the device for optical memory, the reset mechanism has been successfully demonstrated by annealing the device at 50 °C. The developed solution processed, highly transparent, solar-blind photodetector has immense potential for next-generation cost-effective optoelectronic devices. © 1980-2012 IEEE.

K Lakshmi Ganapathi

Department Of Physics

Mamidanna Sri Ramachandra Rao

Tejendra Dixit

Absorption

Annealing

Copper oxides

Cost effectiveness

Energy gap

Gold

Lighting

Optoelectronic devices

Photoconductivity

Photodetectors

Photonic band gap

Photons

CUO THIN FILMS

Persistent Photoconductivity

PHOTO DETECTION

PHOTORESPONSIVITY

REJECTION RATIOS

SOLAR BLIND

SOLAR-BLIND PHOTODETECTORS

Solution-processed

Thin films

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Solution-Processed Transparent CuO Thin Films for Solar-Blind Photodetection

IEEE Electron Device Letters

Optically induced meta-stable states in the semiconductor lattice temporarily change the conductivity which leads to a phenomenon called persistent photo-conductivity (PPC). We report a PPC effect with long retention time of more than 90 h in solution-processed highly transparent CuO thin film. A 254 nm wavelength light source was used to 'set' and thermal annealing at 50°C for 10 minutes and NIR illumination was used to reset PPC effect. Activated trap states without any stimulus which are responsible for PPC effect in CuO thin film has, been investigated by performing temperature-dependent I-V characterization. These trapped charges are released either on heating or illumination with NIR light source. Such a long-enduring PPC achieved in low-cost transparent CuO thin film could pave the way for further study of the feasibility of optically defined, transparent electronics. © 2019 IEEE.

IEEE Journal of Quantum Electronics

Trap Assisted Persistent Photo-Conductivity in Solution-Processed CuO Thin Film

Journal	Data powered by TypesetIEEE Electron Device Letters
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN	07413106
Open Access	No