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Loss Mechanisms in Thick‐Film Low‐Bandgap Polymer Solar Cells
Author(s) -
Small Cephas E.,
Tsang SaiWing,
Chen Song,
Baek Sujin,
Amb Chad M.,
Subbiah Jegadesan,
Reynolds John R.,
So Franky
Publication year - 2013
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.201201114
Subject(s) - materials science , polymer solar cell , active layer , optoelectronics , band gap , photovoltaics , solar cell , hybrid solar cell , quantum dot solar cell , organic solar cell , heterojunction , plasmonic solar cell , polymer , energy conversion efficiency , thin film , layer (electronics) , nanotechnology , photovoltaic system , composite material , electrical engineering , engineering , thin film transistor
Polymer bulk heterojunction solar cells based on low bandgap polymer:fullerene blends are promising for next generation low‐cost photovoltaics. While these solution‐processed solar cells are compatible with large‐scale roll‐to‐roll processing, active layers used for typical laboratory‐scale devices are too thin to ensure high manufacturing yields. Furthermore, due to the limited light absorption and optical interference within the thin active layer, the external quantum efficiencies (EQEs) of bulk heterojunction polymer solar cells are severely limited. In order to produce polymer solar cells with high yields, efficient solar cells with a thick active layer must be demonstrated. In this work, the performance of thick‐film solar cells employing the low‐bandgap polymer poly(dithienogermole‐thienopyrrolodione) (PDTG‐TPD) was demonstrated. Power conversion efficiencies over 8.0% were obtained for devices with an active layer thickness of 200 nm, illustrating the potential of this polymer for large‐scale manufacturing. Although an average EQE > 65% was obtained for devices with active layer thicknesses > 200 nm, the cell performance could not be maintained due to a reduction in fill factor. By comparing our results for PDTG‐TPD solar cells with similar P3HT‐based devices, we investigated the loss mechanisms associated with the limited device performance observed for thick‐film low‐bandgap polymer solar cells.