Non-dissipative internal optical filtering with solution-grown perovskite single crystals for full-colour imaging

Sergii Yakunin,Ihor Cherniukh,Dmitry N Dirin,Yevhen Shynkarenko,Maksym V Kovalenko

doi:10.1038/am.2017.163

Abstract

Herein we demonstrate that solution-grown single crystals of semiconducting methylammonium lead halide perovskites (MAPbX3, where MA=CH3NH3+, X=Cl−, Br− and Br/I−) can be used as semiconductor absorbers for full-colour imaging. A one-pixel photodetector prototype was constructed by stacking three layers of blue-, green- and red-sensitive MAPbCl3, MAPbBr3 and MAPb(Br/I)3 crystals, respectively. The prototype detector was demonstrated to recognize and faithfully reproduce coloured images by recombination of the signals from each individual colour channel. This layered structure concept, besides imparting a two- to three-fold reduction in the number of required pixels, also offers several other advantages over conventional technologies: three times more efficient light utilization (and thus higher sensitivity) than common Bayer scheme devices based on dissipative optical filters, colour moiré suppression and no need for de-mosaic image processing. In addition, the direct band gap structure of perovskites results in optical absorption that is several orders of magnitude greater than silicon. This opens a promising avenue towards the reduction of pixel-size in next-generation devices as compared with conventional silicon-based technologies.

Highlights

Out of the five main senses, sight gives the most important information about the surrounding world to Homo sapiens.[1,2] It relays information as to many properties of an object such as shape, distance and size, and it reveals colour.[3]
Such filters are ubiquitous in technological applications, they suffer from high losses (~2/3 of the total light flux) due to the absorption of light by the filters that cannot be further used.[5,6]
We used a configuration with three parallel registration channels (Figures 2a and b) with four electrical terminals

Summary

Introduction

Out of the five main senses, sight gives the most important information about the surrounding world to Homo sapiens.[1,2] It relays information as to many properties of an object such as shape, distance and size, and it reveals colour.[3]. Cone cells exist in three different types that are each sensitive to only one colour: red, green or blue This natural system is mimicked in three-colour arrays made from Bayer or similar dissipative filters that are selected complimentarily according to a subtractive colour model (Figure 1a).[4] such filters are ubiquitous in technological applications, they suffer from high losses (~2/3 of the total light flux) due to the absorption of light by the filters that cannot be further used.[5,6] In 1999, Merrill[6,7] proposed a novel solution: to stack alternatively doped silicon layers vertically rather than laterally. This configuration requires a more complex and costly manufacturing process

Methods

Results

Conclusion