Solution-based fullerene-free route enables high-performance green-selective organic photodetectors. (1st January 2023)

• Record Type: Journal Article
• Authors: Cao, Yang; Mei, Jianjun; Xia, Kai; Zhao, Ting; Zhao, Jing; Gasparini, Nicola; Pecunia, Vincenzo
• Is Part Of: JPhys materials. Volume 6:Number 1(2023)
• Publication Date: 2023-01-01
• Subjects: narrowband organic photodetectors -- non-fullerene acceptors -- green-selective photodetectors -- narrowband-absorption-type photodetectors -- solution-processed photodetectors; Solid state physics -- Periodicals; Materials science -- Periodicals; 530.41
• DOI: 10.1088/2515-7639/aca222
• Languages: English
• ISSNs: 2515-7639

Abstract

Abstract: Ongoing developments in machine vision, wearables, and the Internet of Things have led to strong demand for easy-to-fabricate, color-selective photodetectors. Narrowband-absorption-type (NBA) printable organic photodetectors provide an attractive solution, given their spectral robustness and fabrication simplicity. However, a key remaining challenge to realizing their potential is to concurrently achieve high photoconversion efficiency and spectral selectivity. Herein, this challenge is tackled by investigating a non-fullerene-based route to green-selective, solution-based photodetectors. Soluble phthalocyanine acceptor PhO-Cl6 BsubPc is considered due to its high absorption selectivity to green photons. Blends with soluble quinacridones are pursued to realize the ideal of a donor:acceptor layer selectively absorbing the target photons throughout its volume. A latent-pigment route to the solution-based deposition of linear trans -quinacridone (QA) enables well-intermixed QA:PhO-Cl6 BsubPc layers. Green-selective photodetectors with cutting-edge performance are thus realized, achieving a 25% increase in external quantum efficiency compared to all prior solution-based NBA implementations, as well as a nearly five-fold enhancement of the green-to-blue spectral rejection ratio. The merit of this approach is further illustrated by comparison with the corresponding fullerene-based photodetectors. By demonstrating an approach to solution-based NBA photodetectors with cutting-edge photoconversion efficiency and spectral selectivity, this study represents an important step toward printable, high-performance organic color sensors and imagers.