Highly Transparent Organic Photodetectors with Transfer-Printed PEDOT:PSS Top Electrodes

• • PEDOT:PSS top electrodes exceed 90% transmittance across UV-Vis-NIR, enabling ST-OPDs with an AVT of 74.8%—a 24.8% absolute improvement over the <60% AVT of conventional 10 nm Ag top electrodes, directly addressing the ~80% display requirement. • • Specific detectivity surpasses 5 × 10^11 Jones, matching or exceeding typical values for metal-electrode OPDs while maintaining high transparency, thereby eliminating the trade-off between sensitivity and visible transparency. • • Dual-sided photoplethysmography heart-rate monitoring is demonstrated from both device sides, a feature unattainable with opaque metal top electrodes, enabling seamless integration with readout circuits for wearable and invisible sensing. • • The transfer-printing process is broadly applicable across various active layers, offering a cost-effective and facile alternative to complex multi-seed-layer metal deposition, with potential for large-area fabrication.