Organic photodiodes: device engineering and applications

Shan, Tong; Hou, Xianhua; Yin, Xianghua; Guo, Xiaojun

doi:10.1007/s12200-022-00049-w

Cited by 26 publications

(9 citation statements)

References 178 publications

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“…According to the relative position of anode and cathode, they can be divided into the conventional structure of the bottom anode and the top cathode, and the inverted structure of the top anode and the bottom cathode. 57 The active layer absorbs photons, and electron-hole pairs can be generated. The generated electron-hole pairs then dissociate into free charge carriers via the built-in voltage/extra reverse bias and are collected by the corresponding electrodes.…”

Section: Device Structuresmentioning

confidence: 99%

Organic photodetectors: materials, device, and challenges

Zhang,

Jiang,

Feng

et al. 2023

J. Mater. Chem. C

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Section: Device Structuresmentioning

confidence: 99%

Organic photodetectors: materials, device, and challenges

Zhang,

Jiang,

Feng

et al. 2023

J. Mater. Chem. C

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“…Flexible photodetectors (PDs) that can convert optical signals into electrical signals are an important part of wearable devices and provide opportunities for the realization of intelligent DOI: 10.1002/admt.202301903 monitoring, 24/7 healthcare, and environmental exploration. [1][2][3][4] In terms of geometrical form, wearable PDs can be divided into two-dimensional (2D) planar PDs and one-dimensional (1D) fiber PDs. [1] In particular, 1D photodetectors prepared on fiber substrates have flourished due to their portability, knittability, and mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Improving Process Compatibility of Multilayer Organic Fiber Photodetectors by Combining Coaxial Thermal Evaporation with Dip‐Coating

Wu,

Li,

et al. 2024

Adv Materials Technologies

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Fiber photodetectors (FPDs) are promising candidates for wearable applications due to their flexibility, knittability, and full‐angle detection. The current state‐of‐the‐art FPDs based on inorganic photosensitive materials show drawbacks in mechanical flexibility. The organic FPDs (OFPDs) are superior, while the fabrication is limited by multi‐layer process compatibility issues. Herein, a diode‐type five‐layer OFPD with Zn/ZnO/PBDB‐T:ITIC‐Th/MoO3/PEDOT:PSS structure is prepared by combining thermal evaporation with a successive dip‐coating method. It is worth mentioning that the uniform coaxial MoO3 interfacial layer is processed by the proposed fiber‐compatible thermal evaporation technique, while the other functional layers are enabled by the solution‐based dip‐coating method. At the bias of −0.5 V, the optimized OFPD exhibits a dark current density of 8.46 × 10−8 A cm−2, a responsivity of 86.4 mA W−1 (@ 760 nm), and a specific detectivity of over 1011 Jones in the visible range of 400–760 nm. Besides, the device displays a fast response speed of 0.44 and 0.14 ms for rise and fall time, showing the capability of full‐angle detection. The device is demonstrated in photoplethysmography for real‐time heart‐rate monitoring, suggesting its potential for practical application in wearable electronics.

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“…The organic photodiode (OPDI) is one of the photodetectors (PDs) made with organic semiconductor materials to convert incident photons into an electrical signal. The PDs have been extensively studied and developed due to their promising applications, such as image sensing, health monitoring, night vision, and environmental monitoring [1][2][3][4][5][6][7]. Of those PDs, organic photodiodes provide unique advantages by virtue of the realization of flexible, lightweight, and wearable devices.…”

Section: Introductionmentioning

confidence: 99%

Analyses of All Small Molecule-Based Pentacene/C60 Organic Photodiodes Using Vacuum Evaporation Method

Kim,

Lee,

Jeon

et al. 2023

Nanomaterials

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The vacuum process using small molecule-based organic materials to make organic photodiodes (OPDIs) will provide many promising features, such as well-defined molecular structure, large scalability, process repeatability, and good compatibility for CMOS integration, compared to the widely used Solution process. We present the performance of planar heterojunction OPDIs based on pentacene as the electron donor and C60 as the electron acceptor. In these devices, MoO3 and BCP interfacial layers were interlaced between the electrodes and the active layer as the electron- and hole-blocking layer, respectively. Typically, BCP played a good role in suppressing the dark current by two orders higher than that without that layer. These devices showed a significant dependence of the performance on the thickness of the pentacene. In particular, with the pentacene thickness of 25 nm, an external quantum efficiency at the 360 nm wavelength according to the peak absorption of C60 was enhanced by 1.5 times due to a cavity effect, compared to that of the non-cavity device. This work shows the importance of a vacuum processing approach based on small molecules for OPDIs, and the possibility of improving the performance via the optimization of the device architecture.

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Organic photodiodes: device engineering and applications

Cited by 26 publications

References 178 publications

Organic photodetectors: materials, device, and challenges

Organic photodetectors: materials, device, and challenges

Improving Process Compatibility of Multilayer Organic Fiber Photodetectors by Combining Coaxial Thermal Evaporation with Dip‐Coating

Analyses of All Small Molecule-Based Pentacene/C60 Organic Photodiodes Using Vacuum Evaporation Method

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