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Optical simulation and experimental determination of the effect of subcell sequence in tetraphenyldibenzoperiflanthene‐ and phthalocyanine‐based tandem solar cells
Author(s) -
Zhu Jun,
Wang Chao,
Yu Junle,
Yang Fang,
Zheng Yanqiong,
Li Xifeng,
Wei Bin
Publication year - 2017
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.201700340
Subject(s) - tandem , photocurrent , energy conversion efficiency , materials science , optoelectronics , phthalocyanine , electrode , quantum efficiency , stack (abstract data type) , nanotechnology , chemistry , computer science , programming language , composite material
In this work, series‐connected double‐junction tandem solar cells were fabricated by employing the complementary absorbing donors of tetraphenyldibenzoperiflanthene (DBP) and chloroaluminum phthalocyanine (ClAlPc). The tandem cell shows a high open circuit voltage of 1.57 V, summing those of single cells. The optical simulation and experimental results both demonstrate that the subcell (SC) sequence plays an important role in photocurrent and fill factor for tandem cells. It is helpful for current matching to use ClAlPc as a donor in the bottom SC for the ClAlPc‐DBP system, because the power conversion efficiency ( η PCE ) is increased by 7% in the ClAlPc‐DBP normal tandem cell relative to the DBP‐ClAlPc reverse tandem cell. The simulated external quantum efficiency (EQE) spectra of the SCs in the DBP‐ClAlPc reverse cell overlap with each other thus resulting in a current mismatch. Via optical modeling, an optimized ClAlPc‐DBP normal tandem cell exhibits a η PCE of 3.24% by slightly tuning layer thickness.