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Performance Enhancement of Polymer‐Free Carbon Nanotube Solar Cells via Transfer Matrix Modeling
Author(s) -
Pfohl Moritz,
Glaser Konstantin,
Ludwig Jens,
Tune Daniel D.,
Dehm Simone,
Kayser Christian,
Colsmann Alexander,
Krupke Ralph,
Flavel Benjamin S.
Publication year - 2016
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.201501345
Subject(s) - materials science , carbon nanotube , absorption (acoustics) , polymer , solar cell , chemical engineering , evaporation , nanotechnology , open circuit voltage , hybrid solar cell , polymer solar cell , optoelectronics , composite material , voltage , physics , engineering , thermodynamics , quantum mechanics
Polymer‐free (6,5) single‐walled carbon nanotubes (SWCNTs) prepared using the gel permeation approach are integrated into SWCNT:C 60 solar cells. Evaporation‐driven self‐assembly is used to form large‐area SWCNT thin films from the surfactant‐stabilized aqueous suspensions. The thicknesses of various layers within the solar cell are optimized by theoretical modeling using transfer matrix calculations, where the distribution of the electric field within the stack is matched to light absorption by the SWCNTs through either their primary (S 11 ) or secondary (S 22 ) absorption peaks, or a combination thereof. The validity of the model is verified experimentally through a detailed parameter study and then used to develop SWCNT:C 60 solar cells with high open‐circuit voltage (0.44 V) as well as a cutting‐edge internal quantum efficiency of up to 86% through the nanotube S 11 transition, over an active area of 0.105 cm 2 .