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Room-Temperature Solution-Processed NiOx:PbI2 Nanocomposite Structures for Realizing High-Performance Perovskite
Hugh Lu Zhu1, Jiaqi Cheng1, Di Zhang1,2
1Department of Electrical and Electronic Engineering, The University of Hong Kong , Pokfulam, Hong Kong, SAR China.
ACS Nano
|June 25, 2016
Summary
Researchers developed NiOx:PbI2 nanocomposite structures for high-performance perovskite photodetectors. This approach suppresses dark current and enhances performance, paving the way for efficient UV-visible photodetection.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Methylammonium lead iodide (MAPbI3) perovskites are promising for photodetectors due to their optoelectronic properties.
- Challenges include suppressing dark current, increasing linear dynamic range, and achieving high detectivity and fast response.
Purpose of the Study:
- To address challenges in perovskite photodetector efficiency using NiOx:PbI2 nanocomposite structures.
- To demonstrate dual functionality for hole extraction and improved MAPbI3 film quality.
Main Methods:
- A room-temperature solution process was used to create NiOx:PbI2 nanocomposite structures.
- These structures were integrated into perovskite photodetectors to facilitate compact, ordered MAPbI3 film growth.
- The nanocomposite layer served as a hole extraction layer, passivating the perovskite surface.
Main Results:
- Optimized NiOx:PbI2 structures led to suppressed dark current (2 × 10(-10) A/cm(2) at -200 mV) and a large linear dynamic range (112 dB).
- High responsivity was observed in the 450-750 nm range, with specific detectivity approaching 10(13) Jones.
- A fast fall time of 168 ns was achieved.
Conclusions:
- NiOx:PbI2 nanocomposite structures effectively improve perovskite photodetector performance by enhancing film quality and charge extraction.
- The demonstrated photodetectors show potential for low-cost, high-performance near-ultraviolet-visible photodetection.
