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True nature of active layers in organic solar cells fabricated by sequential casting of donor and acceptor layers
Author(s) -
Yim Jong Hyuk,
Joe Sungyoon,
Nguyen Duc Cuong,
Ryu Shin Young,
Ha Na Young,
Ahn Y. H.,
Park Jiyong,
Lee Soonil
Publication year - 2017
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201600415
Subject(s) - organic solar cell , materials science , acceptor , bilayer , active layer , heterojunction , exciton , optoelectronics , layer (electronics) , polymer solar cell , energy conversion efficiency , nanotechnology , chemistry , membrane , composite material , polymer , physics , biochemistry , thin film transistor , condensed matter physics , quantum mechanics
The operation characteristics of nominal bilayer (BL) organic solar cells (OSCs), the active layers (ALs) of which consisted of sequentially casted bottom P3HT donor and top ICBA acceptor layers, resembled those of OSCs with bulk heterojunction (BHJ) ALs. Optical analysis and device simulations showed that such resemblance can be attributed to a similarity in the micromorphology of ALs; as‐deposited BL‐type ALs transformed spontaneously into BHJ‐type ALs. The inclusion of P3HT nanowires (NWs) in the donor layers resulted in different AL micromorphology and consequently a larger power conversion efficiency. Separate assessment of the exciton generation and charge–carrier transport and/or extraction showed that the contribution of P3HT NWs was more prominent in optical effects.Transformation of sequentially casted P3HT and ICBA layers into a bulk heterojunction layer accounts for good agreement between measured and simulated J–V curves.