An intermediate band dye-sensitised solar cell using triplet-triplet annihilation.
A new mechanism of charge photogeneration is demonstrated for the first time, based on organic molecular structures. This intermediate band approach, integrated into a dye-sensitised solar cell configuration is shown to generate charges upon illumination with low energy photons. Specifically 610 nm photoexcitation of Pt porphyrins, through a series of energy transfer steps and triplet-triplet annihilation, excites a higher energy absorption onset molecule, which is then capable of charge injection into TiO2. Transient absorption measurements reveal further detail of the processes involved.
School of Chemistry, The University of Wollongong, Wollongong, NSW 2522, Australia.
Catherine
C
Simpson
Tracey M
TM
Clarke
Rowan W
RW
MacQueen
Yuen Yap
YY
Cheng
Adam J
AJ
Trevitt
Attila J
AJ
Mozer
Pawel
P
Wagner
Timothy W
TW
Schmidt
Andrew
A
Nattestad