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Effect of substrate bias on mist deposition of conjugated polymer on textured crystalline‐Si for efficient c‐Si/organic heterojunction solar cells
Author(s) -
Ohki Tatsuya,
Ichikawa Koki,
Hossain Jaker,
Fujii Yasuhiko,
Hanajiri Tatsuro,
Ishikawa Ryo,
Ueno Keiji,
Shirai Hajime
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.201532951
Subject(s) - pedot:pss , materials science , substrate (aquarium) , chemical engineering , heterojunction , silicon , polymer solar cell , analytical chemistry (journal) , layer (electronics) , solar cell , nanotechnology , optoelectronics , organic chemistry , chemistry , oceanography , engineering , geology
We investigated the chemical mist deposition (CMD) of poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) on textured crystalline silicon (c‐Si) substrate for efficient c‐Si/PEDOT:PSS heterojunction solar cells. The Mie scattering observation and differential mobility analysis characterization revealed that the average size of mist particle decreased from 330 to 30–40 nm with increasing the number density and traveling velocity of mist precursor when positive dc bias of 10 kV was applied to the c‐Si substrate. The uniform deposition of PEDOT:PSS films was performed on textured c‐Si with the increased adhesion by suitably adjusting V s and substrate temperature. A power conversion efficiency (PCE) of 11.57% was obtained with J sc of 36.1 mA cm −2 , V oc of 0.49 V, and FF of 0.66, when a positive V s of 10 kV was applied to c‐Si substrate. Furthermore, PCE increased to 12.5% with J sc of 35.6 mA cm −2 , V oc of 0.53 V, and FF of 0.67 by adding a 20‐nm‐thick AR coating layer of molybdenum oxide MoO x (refractive index, n = 2.1) fabricated by CMD using 12 molybdo(VI) phosphoric acid n‐hydrate [H 3 (PMo 12 O 40 ) · n H 2 O] as a precursor. These findings imply that CMD using negatively charged mist precursor is a possible method for the uniform deposition of PEDOT:PSS on textured c‐Si substrate for efficient c‐Si/PEDOT:PSS heterojunction solar cells.