Indeno[1,2-b]carbazole-Based Hole Conductor Enables a High-Performance Colloidal Quantum Dot NIR Photodetector

Colloidal quantum dot-based photodetectors (PDs) have been undergoing a blooming boost for their prominent photoelectric performance and convenient solution processability. However, the widely used hole transport layer (HTL) 1,2-ethanedithiol (EDT) retains several drawbacks such as a mismatched energy level, existing defects, need for oxidation, and multilayer fabrication. Organic p-type materials, which possess commendable characteristics and synthetic adaptability, have emerged as promising alternatives for the traditional EDT HTL. Herein, we proposed an indeno[1,2-b]carbazole-based organic HTL, named MeOP-DSF. Owing to the optimized band alignment and enhanced interfacial charge dynamics, the carrier generation and collection process are effectively enhanced. The MeOP-DSF-based PDs demonstrate a photoresponsivity of 0.44 A/W, a noise current of 1.1 x 10(-9) A Hz(-0.5), a specific detectivity of 6.9 x 10(8) Jones, and a broad linear dynamic range of 104 dB, outperforming the performance of EDT-based devices on all fronts. This work demonstrates the outstanding potential of organic p-type materials and may provide a universal approach for high-performance PDs.