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Updated: May 12, 2026

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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Published on: June 18, 2013

Two-Dimensional Perovskite Single-Nanowire Photodetectors.

Avija Ajayakumar^1,2,3, Jeong Hui Kim¹, Nemanja Ninkovic⁴

¹Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

ACS Photonics

|May 11, 2026

Summary

Single 2D perovskite nanowires offer high performance for microphotodetectors. These devices show excellent responsivity, detectivity, and stability, paving the way for advanced optoelectronics.

Keywords:

microphotodetectors perovskite nanowire responsivity thickness dependency ultralow dark current

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

High-performance microphotodetectors need materials with strong light interaction, fast charge transport, and stability.
Two-dimensional (2D) perovskites are promising for optoelectronic applications.

Purpose of the Study:

To demonstrate single-nanowire microphotodetectors based on the 2D perovskite (TPA3)2PbBr4.
To characterize their performance, stability, and the influence of nanowire thickness.

Main Methods:

Controlled slow-cooling self-assembly to synthesize defect-minimized 2D perovskite nanowires.
Fabrication and testing of single-nanowire microphotodetector devices.
Optical penetration depth analysis to study charge collection efficiency.

Main Results:

Achieved ultralow dark currents (~10^-15 A) and high responsivity (156 mA W^-1).
Demonstrated exceptional specific detectivity (~10^11 Jones) with millisecond response times.
Exhibited stable operation and remarkable ambient stability over weeks.

Conclusions:

Single 2D perovskite nanowires are a viable platform for miniaturized, high-performance microphotodetectors.
Device performance is linked to suppressed thermal noise and trap-filling dynamics.
Nanowire thickness is a key design parameter for optimizing photodetector efficiency.