Formation of nanopatterned polymer blends in photovoltaic devices.
In this paper, we demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer heterojunctions of composition and morphology that can be selected independently. We fabricated photovoltaic (PV) devices with extremely high densities (10(14)/mm(2)) of interpenetrating nanoscale columnar features in the active polymer blend layer. The smallest feature sizes are as small as 25 nm on a 50 nm pitch, which results in a spacing of heterojunctions at or below the exciton diffusion length. Photovoltaic devices based on double-imprinted poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2',2''-diyl) (F8TBT)/ poly(3-hexylthiophene) (P3HT) films are among the best polymer-polymer blend devices reported to date with a power conversion efficiency (PCE, eta(e)) of 1.9%.
He
Ximin
X
The Nanoscience Centre, University of Cambridge, Cambridge, United Kingdom.
Gao
Feng
F
Tu
Guoli
G
Hasko
David
D
Hüttner
Sven
S
Steiner
Ullrich
U
Greenham
Neil C
NC
Friend
Richard H
RH
Huck
Wilhelm T S
WT
D052160:Benzothiazoles / Q000737:chemistry*; D011211:Electric Power Supplies; D004563:Electrochemistry; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties; D013876:Thiophenes / Q000737:chemistry*
D052160:Benzothiazoles; D011108:Polymers; D013876:Thiophenes; C550774:poly((9,9-dioctylfluorene)-2,7-diyl-alt-(4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole)-2',2''-diyl); C507295:poly(3-hexylthiophene)