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.
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