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2015 ; 5
(ä): 11558
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Power generating reflective-type liquid crystal displays using a reflective
polariser and a polymer solar cell
#MMPMID26101099
Ho Huh Y
; Park B
Sci Rep
2015[Jun]; 5
(ä): 11558
PMID26101099
show ga
We herein report the results of a study of a power generating reflective-type
liquid crystal display (LCD), composed of a 90° twisted nematic (TN) LC cell
attached to the top of a light-absorbing polymer solar cell (PSC), i.e., a
Solar-LCD. The PSC consisted of a polymer bulk-heterojunction photovoltaic (PV)
layer of
poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]
and [6,6]-phenyl C71 butyric acid methyl ester (PCDTBT:PCBM70), and showed a high
power conversion efficiency of about 5%. In order to improve the visibility of
the Solar-LCD, between the TN-LC and the PV cells we inserted a reflective
polariser of a giant birefringent optical (GBO) film. The reflectivity from the
Solar-LCD was observed to be considerably increased by more than 13-15% under
illumination by visible light. The Solar-LCD also exhibited a significantly
improved contrast ratio of more than 17-19. We believe there is a clear case for
using such Solar-LCDs in new power-generating reflective-type displays; taken as
a whole these results also demonstrate the possibility of their application in a
number of energy-harvesting opto-electrical display devices.