Organic photovoltaic cells with stable top metal electrodes modified with polyethylenimine.
Efficient organic photovoltaic cells (OPV) often contain highly reactive low-work-function calcium electron-collecting electrodes. In this work, efficient OPV are demonstrated in which calcium electrodes were avoided by depositing a thin layer of the amine-containing nonconjugated polymer, polyethylenimine (PEIE), between the photoactive organic semiconductor layer and stable metal electrodes such as aluminum, silver, or gold. Devices with structure ITO/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/poly(3-hexylthiophene):indene-C60-bis-adduct (P3HT:ICBA)/PEIE/Al demonstrated overall photovoltaic device performance comparable to devices containing calcium electron-collecting electrodes, ITO/PEDOT:PSS/P3HT:ICBA/Ca/Al, with open-circuit voltage of 775±6 mV, short-circuit current density of 9.1±0.5 mA cm(-2), fill factor of 0.65±0.01, and power conversion efficiency of 4.6±0.3%, averaged over 5 devices at 1 sun.
Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, 777 Atlantic Drive NW, Georgia Institute of Technology , Atlanta, Georgia 30332-0250, United States.
Talha M
TM
Khan
Yinhua
Y
Zhou
Amir
A
Dindar
Jae Won
JW
Shim
Canek
C
Fuentes-Hernandez
Bernard
B
Kippelen