Abstract
Zinc oxide ( ZnO ) nanowire (NW) films were synthesized at low temperature (95°C) through amine-assisted solution process and used as photoanode for the fabrication of dye-sensitized solar cells (DSSCs). It was found that with the addition of polyethyleneimine (PEI) and ammonium hydroxide ( NH 4 OH ) in growth solution, the NWs were smaller in diameter and longer in length by prolonging the growth time without refreshing the growth solution. A reasonable overall conversion efficiency of 1.25% was achieved with photoanode based on ZnO NWs containing PEI and NH 4 OH . However, DSSC fabricated with ZnO NWs not containing PEI and NH 4 OH showed low conversion efficiency of 0.58%. All the DSSCs exhibited almost similar values of open circuit voltage (V OC ) and fill factor (FF). Interestingly, DSSC based on ZnO NWs with PEI and NH 4 OH obtained two times higher short circuit current density (J SC ) compared to ZnO NWs photoanode without PEI and NH 4 OH . The increase in efficiency and J SC with the length of NWs is attributed to the increase in internal surface area for sufficient dye loading and light harvesting.
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