Flexible non-fullerene organic photodetectors enabled by a tin ions-chelated polymer cathode interfacial layer

Jianhua Xiao; Huiling Tai; Qingxia Liu; Yang Wang

doi:10.1117/12.2690707

17 August 2023 Flexible non-fullerene organic photodetectors enabled by a tin ions-chelated polymer cathode interfacial layer

Jianhua Xiao, Huiling Tai, Qingxia Liu, Yang Wang

Author Affiliations +

Proceedings Volume 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023); 127571U (2023) https://doi.org/10.1117/12.2690707
Event: 3rd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2023), 2023, Kunming, China

Abstract

Organic photodetectors (OPDs) have attracted extensive attention due to their high flexibility, strong adaptability, lowcost, and compatibility with large-scale manufacturing technologies. However, achieving high specific detection (D*) and mechanical flexibility remains a challenge for flexible non-fullerene OPDs. A well-designed cathode interfacial layers (CILs) with good flexibility and stability is essential. Herein, a flexible CIL of tin ion-chelated polyethyleneimine ethoxylated (denoted as PEIE-Sn) is presented, which can effectively endow the devices with optimized cascade alignment and improved interface compatibility. The resulting flexible OPD exhibits an external quantum efficiency (EQE) of 59% and specific detectivity (D*) of 7.95*10¹² Jones (720 nm, -0.5 V) with a slight change after 1500 bending cycles. OPD has been validated through heart rate monitoring using the photoplethysmography (PPG) method, demonstrating its potential application in wearable devices.

Citation Download Citation

Jianhua Xiao, Huiling Tai, Qingxia Liu, and Yang Wang "Flexible non-fullerene organic photodetectors enabled by a tin ions-chelated polymer cathode interfacial layer", Proc. SPIE 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023), 127571U (17 August 2023); https://doi.org/10.1117/12.2690707

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