Open AccessA PbS nanocrystal-C60 photovoltaic device for infrared light harvesting
Author(s) -
D. M. N. M. Dissanayake,
Ross A. Hatton,
Thierry Lutz,
Cristina E. Giusca,
Richard J. Curry,
S. Ravi P. Silva
Publication year - 2007
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.2790730
Subject(s) - x ray photoelectron spectroscopy , nanocrystal , lead sulfide , materials science , optoelectronics , ultraviolet photoelectron spectroscopy , open circuit voltage , ultraviolet , infrared , heterojunction , annealing (glass) , photosensitivity , spectroscopy , short circuit , quantum dot , nanotechnology , voltage , optics , chemical engineering , physics , engineering , quantum mechanics , composite material
PbS nanocrystal (nc-PbS)-C60 photovoltaic devices are demonstrated, in which nc-PbS function as electron donors, showing infrared photosensitivity up to 1600nm. Annealing nc-PbS is proved to remove capping oleic acid ligands, studied using x-ray photoelectron spectroscopy, significantly improving the short circuit current, open circuit voltage, and fill factor. The device performance is rationalized by quantum confinement in nc-PbS and energy level alignment at the heterojunction based on direct measurements of nc-PbS ionization potential using ultraviolet photoelectron spectroscopy.
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