All-organic thin film flexible photodetector based on C₆₀ modified PEDOT:PSS

Abstract

In organic electronics, the use of self-assembled monolayer dielectric functional groups is considered an effective surface modification strategy that can significantly improve device performance. A flexible polymer (PEDOT:PSS) photodetector on the substrate polyimide with broadband response (450 nm ∼ 980 nm) and high response (0.56 A W −1 ) is reported, which is superimposed on the surface by small molecule (C 60 ) thermal evaporation. In addition, the planeness of the organic semiconductor and the overall performance of the organic thin film photodetector can be improved significantly by using a small molecule modified polymer thin film ; the photocurrent, R i and external quantum efficiency were all increased by more than 10%. The response time of the device reached an astonishing 5.87 ms, much faster than that of similar devices. The response of the small molecule modified organic device is improved by an order of magnitude, which provides a guarantee for better application of organic thin films in circuits. Moreover, the device has a strong flexible stability performance, which can meet the requirements of flexible stability for future photoelectric devices.

Recent Progress of Flexible Image Sensors for Biomedical Applications

“…CdS is a commonly used material for the photoresistor, which has nonpolarity and ohmic properties [66] (Figure 8). Recently, many flexible 2D material-based photoresistors, such as MoS 2 [67] (Figure 8a), Poly (3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), [68] and perovskite [69] (Figure 8b), have been reported.…”

Organic Light-Dependent Resistors with Near Infrared Light-Absorbing Conjugated Polymer Films

“…Recently, it has been reported that poly­(3-hexylthiophene) (P3HT):phenyl-C 61 -butyric acid methyl ester (PCBM) films can be used as an active layer in the similar planar structure of LDR for visible light detection . It has been also reported that the fullerene (C60)-modified PEDOT:PSS films can detect the broad range light of 450 to ∼980 nm . Another study has shown that photodetectors with perovskite/conjugated polymer films were able to sense a broad range (365 to ∼940 nm) of light .…”

“…26 It has been also reported that the fullerene (C60)-modified PEDOT:PSS films can detect the broad range light of 450 to ∼980 nm. 33 Another study has shown that photodetectors with perovskite/conjugated poly- mer films were able to sense a broad range (365 to ∼940 nm) of light. 39 These previous works based on organic materials have focused on the light-sensing performances, including near-infrared (NIR) range as a part, in a viewpoint of photodetectors but the electrical resistance required for LDRs has not been mainly studied, even though LDRs based on inorganic materials such as bismuth sulfide (Bi 2 S 3 ) and germanium (Ge) have been studied for the detection of NIR light.…”

Near Infrared Light‐Sensing Organic Light‐Dependent Resistors Based on Dialkoxybenzothiadiazole‐Containing Conjugated Polymer

“…In addition, the inorganic LDRs have a limited flexibility and/or transparency owing to the inherently rigid (hard) and/or brittle characteristics of constituent inorganic materials used for LDRs. [ 15,16 ] On this account, organic materials have been introduced for the fabrication of LDR‐like devices with a planar geometry because of their advantages in flexibility and optical transparency. [ 17–20 ]…”

“…In addition, the inorganic LDRs have a limited flexibility and/or transparency owing to the inherently rigid (hard) and/or brittle characteristics of constituent inorganic materials used for LDRs. [15,16] On this account, organic materials have been introduced for the fabrication of LDR-like devices with a planar geometry because of their advantages in flexibility and optical transparency. [17][18][19][20] However, most of the early studies have been restricted to the investigation of photocurrent only without the detailed data of electrical resistances, even though a few works have reported on the electrical resistance of devices.…”