부산대학교 도서관

Zinc oxide (ZnO) nanowire (NW) ¯lms were synthesized at low temperature (95C) throughamine-assisted solution process and used as photoanode for the fabrication of dye-sensitized solarcells (DSSCs). It was found that with the addition of polyethyleneimine (PEI) and ammoniumhydroxide (NH 4 OH) in growth solution, the NWs were smaller in diameter and longer in lengthby prolonging the growth time without refreshing the growth solution. A reasonable overallconversion e±ciency of 1.25% was achieved with photoanode based on ZnO NWs containing PEIand NH 4 OH. However, DSSC fabricated with ZnO NWs not containing PEI and NH 4 OH showedlow conversion e±ciency of 0.58%. All the DSSCs exhibited almost similar values of open circuitvoltage ( V OC) and ¯ll factor (FF). Interestingly, DSSC based on ZnO NWs with PEI and NH 4 OHobtained two times higher short circuit current density ( J SC) compared to ZnO NWs photoanodewithout PEI and NH 4 OH. The increase in e±ciency and J SC with the length of NWs is attributedto the increase in internal surface area for su±cient dye loading and light harvesting.