High Sensitivity Hybrid PbS CQD-TMDC Photodetectors up to 2 μm

• DOI: 10.1021/acsphotonics.9b00870
• Publication Date: 2019-09-25T15:14:49Z
• Authors: Onur Özdemir; Iñigo Ramiro; Shuchi Gupta; Gerasimos Konstan...
• Keywords: Molybdenum disulfide; Tungsten disulfide; Lead sulfide

Recent approaches to develop infrared photodetectors characterized by high sensitivities, broadband spectral coverage, easy integration with silicon electronics and low cost have been based on hybrid structures of transition metal dichalcogenides (TMDCs) PbS colloidal quantum dots (CQDs). However, date, such reported sensitivity up 1.5 $\mu$m. Here we extend the coverage this technology towards 2 $\mu$m demonstrating for first time compelling performance responsivities 1400 A/W at 1.8 1V bias detectivities as $10^{12}$ Jones room temperature. To do studied two TMDC materials a carrier transport layer, tungsten disulfide (WS$_2$) molybdenum (MoS$_2$) demonstrate that WS$_2$ outperform those MoS$_2$ due more adequate band alignment favors transfer from CQDs.