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Measuring the exciton diffusion length of C 60 in organic planar heterojunction solar cells
Author(s) -
Qin Dashan,
Gu Peng,
Dhar Rudra Sankar,
Razavipour Seyed Ghasem,
Ban Dayan
Publication year - 2011
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.201026724
Subject(s) - exciton , heterojunction , organic solar cell , diffusion , materials science , planar , phthalocyanine , optoelectronics , layer (electronics) , electron , nanotechnology , condensed matter physics , physics , polymer , computer graphics (images) , quantum mechanics , computer science , composite material , thermodynamics
Abstract Planar copper phthalocyanine (CuPc)/C 60 heterojunction solar cells with a 2 nm layer of bathocuproine (BCP) inserted into the C 60 layer were fabricated and characterized. The 2 nm BCP layer in the devices was used as an electronically selective sieve allowing the electron current through but blocking the excitons in the C 60 layer. By combining the experimental results with the optical modeling, the effective triplet exciton diffusion length in C 60 was confirmed to be 30–35 nm under the device working condition. We demonstrate a simple, useful method to determine the exciton diffusion lengths of organic electron acceptors.