High-Performance, Self-Powered Photodetectors Based on Perovskite and Graphene

Abstract

An ideal photodetector must exhibit a fast and wide tunable spectral response, be highly responsive, have low power consumption, and have a facile fabrication process. In this work, a self-powered photodetector with a graphene electrode and a perovskite photoactive layer is assembled for the first time. The graphene electrode is prepared using a solution transfer process, and the perovskite layer is prepared using a solution coating process, which makes the device low cost. Graphene can form a Schottky junction with TiO to efficiently separate/transport photogenerated excitons at the graphene/perovskite interface. Unlike the conventional photovoltaic structure, in this photodetector, both photogenerated electrons and holes are transported along the same direction to graphene, and electrons tunneled into TiO are collected by the cathode and holes transported by graphene are collected by the anode; therefore, the photodetector is self-powered. The photodetector has a broad range of detection, from 260 to 900 nm, an ultrahigh on-off ratio of 4 × 10, rapid response to light on-off (<5 ms), and a high level of detection of ∼10 Jones. The high performance is primarily due to the unique charge-transport property of graphene and strong light absorption properties of perovskite. This work suggests a new method for the production of self-powered photodetectors with high performance and low power consumption on a large scale.

Precise Control of Interfacial Charge Transport for Building Functional Optoelectronic Devices

“…To solve the first problem, we and some other groups modified the graphene/environment interface with stimuli‐active components to fabricate graphene‐based hybrid chemical sensors or photodetectors with highly sensitive responses to external stimuli. A variety of graphene composites, such as graphene/polymer composites, have also been used as active sensing materials to improve the performances of graphene‐based gas sensors .…”

“…It is possible to efficiently separate and transport photogenerated excitons at the graphene/perovskite heterointerface. This sets the foundation for self‐powered photodetectors with a high sensitivity and response speed (Figure e) . Figure f shows the transporting mechanism of the photodetector.…”

“…Recently, we and some other groups found that more efficient functional and hybrid devices can be realized by building more complicated ternary interfaces (Figure e) such as semiconductor/recognition receptor/environment interfaces for specific light/chemistry/biosensing (Figure e, left), or a dye/single layer graphene (SLG)/titanium oxide (TiO 2 ) ternary interface, for efficient charge transport and photovoltaic conversion (Figure e, middle and right). The key to this idea is to separate the signal recognition from charge transport, each performing its own functions without interfering with the other.…”

CVD growth of perovskite/graphene films for high-performance flexible image sensor

“…When the power was reduced to 1 pW, the photoresponsivity was~10 7 A/W. This value is comparable or higher than that for previous MAPbI 3 /graphene film-based photodetectors [1,5,16,29,[31][32][33][34][35][36][37][38][39].…”

Graphene- and Carbon-Nanotube-Based Transparent Electrodes for Semitransparent Solar Cells

“…An enormous amount of effort is being devoted to the development of transparent conductive films employing thin metallic films, conductive polymers, metal oxides, metal meshes, nanowire networks, carbon nanotubes (CNTs), and graphene [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. In particular, CNTs and graphene have received increasing attention because of their excellent optoelectronic properties, such as their high optical transparency, low sheet resistance, and high mobility.…”