Efficient, high-bandwidth organic multilayer photodetectors

Autor:	Peter Peumans, S. R. Forrest, Vladimir Bulovic
Rok vydání:	2000
Předmět:	Free electron model Materials science Physics and Astronomy (miscellaneous) business.industry Exciton Photonic integrated circuit Photodetector Condensed Matter::Materials Science Full width at half maximum Stack (abstract data type) Optoelectronics Quantum efficiency business Quantum tunnelling
Zdroj:	Applied Physics Letters. 76:3855-3857
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.126800
Popis:	Organic photodetectors incorporating an ultrathin (⩾5 A) donor–acceptor alternating multilayer stack as the optically active region exhibit external quantum efficiencies of 75% across the visible spectrum, and have subnanosecond response times. Photogenerated excitons efficiently dissociate into free electrons and holes by rapid charge-transfer across the several closely spaced organic-layer interfaces. The dependence of the quantum efficiency on applied voltage and layer thickness suggests that escape of photogenerated carriers from potential wells formed by the multilayers due to tunneling prior to recombination leads to the high efficiencies observed. The impulse response of the highest-bandwidth devices is characterized by a full width at half maximum of (720±70) ps. The performance of these devices makes them a useful building block for molecular organic photonic integrated circuits.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae1fff99e0a6fcc7d35e0f9e1169a3e8 https://doi.org/10.1063/1.126800 Zobrazit plný text záznamu