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Organic and Inorganic Blocking Layers for Solution‐Processed Colloidal PbSe Nanocrystal Infrared Photodetectors
Author(s) -
Sarasqueta Galileo,
Choudhury Kaushik Roy,
Subbiah Jegadesan,
So Franky
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201001328
Subject(s) - materials science , nanocrystal , photodetector , diphenylamine , infrared , optoelectronics , blocking (statistics) , dark current , colloid , layer (electronics) , nanotechnology , optics , chemical engineering , metallurgy , statistics , physics , mathematics , engineering
A PbSe solution‐processed nanocrystal‐based infrared photodetector incorporating carrier blocking layers is demonstrated, and significant reduction of dark current is achieved. Detectivity values close to 10 12 Jones are achieved by using poly[(9,9′‐dioctylfluorenyl‐2,7‐diyl)‐ co ‐(4,4′‐( N ‐(4‐ sec ‐butyl))diphenylamine)] (TFB) and ZnO nanocrystals (NC) as the electron blocker and hole blocker, respectively. An improvement in lifetime is also observed in the devices with the ZnO NCs hole blocking layer.