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Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping
Author(s) -
Kim Junghwan,
Yu Kilho,
Kim Heejoo,
Kwon Sooncheol,
Kim Geunjin,
Kwon Kyungchoon,
Lee Kwanghee
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201301502
Subject(s) - materials science , polymer solar cell , doping , active layer , heterojunction , vanadium oxide , lone pair , optoelectronics , charge carrier , vanadium , charge (physics) , hybrid solar cell , layer (electronics) , chemical engineering , nanotechnology , solar cell , organic chemistry , chemistry , physics , quantum mechanics , molecule , metallurgy , thin film transistor , engineering
A new strategy for improving the charge extraction in thick bulk heterojunction (BHJ) polymer solar cells (PSCs) is reported. By the deposition of a solution‐processed vanadium oxide (s‐VO x ) onto BHJ active layers, conductive charge‐transport channels are formed inside the active layer via a charge‐transfer doping reaction between the lone‐pair electrons of the sulfur atoms in the polymer and the Lewis‐acidic vanadium atoms of the s‐VO x . Because the charge‐transport channels significantly reduce charge recombination in the BHJ films, high internal quantum efficiencies (IQEs) of over 80% are achieved in the thick inverted PSCs (≈420 nm). This finding represents a new strategy for improving the efficiency and feasibility of printable photovoltaic devices.