High performance blue light detector based on ZnO nanowire arrays

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Organic-inorganic hybrid heterojunctions offer a promising avenue for developing cost-effective and high-performance photoelectric devices.
• Zinc oxide nanowire arrays (ZNAs) and spiro-MeOTAD are key materials in advanced electronic applications.

Purpose of the Study:

• To fabricate and characterize a p-n junction diode using ZnO nanowire arrays (ZNAs) and spiro-MeOTAD.
• To evaluate the performance of the ZNAs/spiro-MeOTAD heterojunction as a photoelectric device, particularly for blue light detection.

Main Methods:

• Fabrication of a p-n junction diode by combining inorganic ZnO nanowire arrays (ZNAs) with organic spiro-MeOTAD.
• Measurement of photoresponsivity and photocurrent time response under varying light conditions.

Main Results:

• A maximum photoresponsivity of 1.32 mA/W was achieved at zero bias.
• The heterojunction exhibited rapid, consistent, and repeatable photocurrent time responses.
• For blue light (410 nm, 75 μW/cm²), rise and decay time constants were measured at 0.12 s and 0.06 s, respectively.

Conclusions:

• The ZNAs/spiro-MeOTAD heterojunction demonstrates significant potential for efficient photoelectric conversion.
• This material system is a strong candidate for developing self-powered blue light detectors.