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Dual mechanism of photoresponse in composite Si–Au nanolayers on crystalline silicon
Author(s) -
Ken Olga,
Yavsin Denis,
Dementev Peter,
Gurevich Sergey,
Sreseli Olga
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201600382
Subject(s) - photocurrent , materials science , silicon , substrate (aquarium) , spectral sensitivity , layer (electronics) , optoelectronics , composite number , crystalline silicon , volume fraction , photoconductivity , biasing , nanotechnology , voltage , composite material , wavelength , oceanography , geology , physics , quantum mechanics
Silicon‐based structures comprised of crystalline silicon substrates and active layers of mixed silicon and gold nanoparticles were fabricated and characterized. Several layer compositions were studied. The investigated structures demonstrate very large spectral sensitivity (more than 10 A W −1 ) in the wide spectral range (400–1000 nm). Such large sensitivity implies presence of photocurrent amplification. A model which involves dual mechanism of the photoresponse was proposed in order to explain the appearance of the photocurrent amplification in the investigated structures. Spectral sensitivity of the structure with composite layer of Si and Au nanoparticles on Si substrate (Au volume fraction is ∼50%) at reverse bias voltage of −0.4 V.