Recent Progress on Broadband Organic Photodetectors and their Applications

Abstract

As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) outperform the commercial inorganic photodetectors in terms of solution and large-area processability, mechanical flexibility, tunable spectral response range, low-cost manufacturing, and light weight. The OPDs with broadband spectral response attract an extensive attention due to their potential in wide application fields, such as flexible image sensing, surveillance, and health monitoring. In this review, recent advances in broadband OPDs are summarized as two sections: i) Photodiode type OPDs (PD-OPDs) based on thick-film strategy, ternary strategy, interfacial engineering, and multilayered strategy. ii) Photomultiplication type OPDs (PM-OPDs) with traps in active layer, traps in interfacial layer, and charge blocking layer. Some real applications on image sensors and photoplethysmography (PPG) sensors are also introduced on the basis of broadband OPDs. New insights on developing the broadband OPDs are put forward for improvement of broadband OPDs.

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

“…The molecular crystal coherence length (CCL) can be calculated according to Scherrer equation: CCL = 2 πk /Δ q , in which k represents Scherrer constant of ≈0.9, and Δ q represents the full width at half maximum of diffraction peak. [ 6,53 ] The detailed diffraction vector values of diffraction peaks and molecular CCL in different blend films are listed in Table S2, Supporting Information. In the optimal ternary blend films, the CCL associated with π–π stacking and lamellar stacking are 3.06 nm and 14.13 nm, respectively, which are larger than 2.41 and 11.53 nm of PM6:BTP‐BO‐4F blend films, as well as 2.31 and 6.21 nm of PM6:Y6‐1O blend films.…”

Supramolecular engineering of charge transfer in wide bandgap organic semiconductors with enhanced visible-to-NIR photoresponse

“…Hitherto, various kinds of self-assembled supramolecular nanostructures have demonstrated promising light-response from UV to visible light when embedded as active layers in photodetectors [16][17][18][19] . However, to the best of our knowledge, NIR organic phototransistors based on wide bandgap crystalline supramolecular nanowires have not yet been reported 3,20,21 . The wiring-up of discrete and anisotropic nanostructures/microstructures, to ensure a reproducible performance and integration in real supramolecular optoelectronics devices, still represents a major challenge [22][23][24][25] .…”

High-performance broadband photodetectors based on all-inorganic perovskite CsPb(Br/I)3 nanocrystal/CdS-microwire heterostructures

“…[1][2][3][4][5][6] Photodetectors are of great importance because of their excellent performance and wide application in photoswitching, photoelectric conversion, and optical communication. [7][8][9][10][11] Several groups have proposed photodetectors fabricated using different CdS nanostructures. [12][13][14] Although this is considered a breakthrough in the eld, these photodetectors exhibit relatively restricted performance due to the limited optoelectronic-transfer efficiency and light-absorption ability of the CdS nanomaterials.…”