Towards high-performance photodetectors based on quasi-2D Ruddlesden-Popper mixed-n perovskite nanomaterials

TL;DR

This study explores how different morphologies of quasi-2D perovskite nanomaterials affect photodetector performance, finding nanostripes with weak confinement offer superior optoelectronic properties and fast response times.

Contribution

It demonstrates that nanostripes with weak quantum confinement in quasi-2D perovskites achieve higher photodetector efficiency and faster response, advancing the design of high-performance, cost-effective photodetectors.

Findings

Nanostripes show highest photoresponsivity of 183 mA/W

Nanostripes achieve EQE of 56% and detectivity of 2.9*10^11 Jones

Fast photoresponse with tau_r=3.4 ms and tau_f=4.3 ms

Abstract

The excellent optoelectronic properties, straightforward synthesis, and robust material stability of quasi-2D metal halide perovskites have made them a hot research topic for optoelectronic devices. In layered organic-inorganic perovskites, the optoelectronic properties are greatly influenced by morphology and quantum confinement, which are crucial for their photodetection performance and offer an excellent tunability tool. Here we investigated the optoelectronic properties and photodetection performance of quasi-2D methylammonium lead bromide perovskites with three different morphologies nanoplatelets, nanosheets, and nanostripes produced by colloidal hot injection technique. The structural and optical characterization reveals the mixed-n phases with varying extents of confinement. Our study shows that nanostripes with the weak confinement effect exhibit superior photodetection performance. They demonstrate highest photoresponsivity, EQE, and detectivity of 183 mA/W, 56 % and 2.9*10^11 Jones respectively. They also show the highest on/off ratio and fastest photoresponse (tau_r=3.4 ms and tau_f=4.3 ms) in comparison to nanoplatelets and nanosheets. Our study will aid in realizing an inexpensive high-performance photodetector based on nanoparticles of quasi-2D perovskites.