High Detectivity All‐Printed Organic Photodiodes

Abstract

All-printed organic photodiode arrays on plastic are reported with average specific detectivities of 3.45 × 10(13) cm Hz(0.5) W(-1) at a bias of -5 V. The blade-coated polyethylenimine cathode interlayer and active layer, and screen-printed anode enable precise device performance tunability and excellent homogeneity at centimetric scales. These devices' high operational reverse bias, good linear dynamic range, and bias stress stability make them attractive for implementation in imaging systems.

Solution-processed semiconductors for next-generation photodetectors

“…8 This has been also demonstrated in fully printed PCDTBT:PC70BM photodiodes. 32 OPD progress is strongly coupled to improvements in organic solar cells, in particular to the use of new materials with narrower optical gaps, 33,34 and to advances in the understanding of device electro-optics manipulation. 35,36 Spectral responses up to 1000 nm have been reported, 30,31,37 but decreasing the optical gap of organic semiconductors to below 1 eV is challenging.…”

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

“…[ 102 ] Functional materials with a high paste-like viscosity (1000-100 000 cP) can be deposited via screen printing and stencil printing. [ 103,111 ] Molding is also compatible with roll-to-roll manufacturing, but the fl ow rate into the mold pattern and curing speed is a critical factor in determining the maximum throughput speed. [ 104 ] Solution processing can even be integrated with textile substrates, which are conformal and robust.…”

Charge-integrating organic heterojunction phototransistors for wide-dynamic-range image sensors

“…Printable photodetectors, including phototransistors and photodiodes, have potential for the creation of low-cost but high-performance image sensors on flexible substrates [4][5][6][7][8][9][10][11][12] , and could open new methods of imaging not possible with rigid substrates 13,14 . Phototransistors produce photoconductive gain, which is not seen in photodiodes, and results in external quantum efficiencies (EQEs) well over 100% (refs 15-20).…”