| 초록 |
We demonstrate that a membrane having A/B/A type layered structure, composed of microporous electrolyte-philic PVdF-HFP gel-coating (A) and macroporous PE or PET non-woven matrix (B), provides an optimum combination of high ion conductivity and electrolyte retention capability for DSSC. DSSC assembled with the PVdF-HFP/PET non-woven/ PVdF-HFP triple layered composite separators exhibits a high initial solar conversion efficiency (η) of 5.5% (only 11% lower than that of DSSC with reference liquid electrolyte, 6.2%), demonstrating good ion conductivity and improved interfacial contact with electrodes. More importantly, the DSSC exhibits almost no change in η value over 44 days, verifying excellent electrolyte retention capability and long term stability. These results demonstrate that the layer-structured composite separator membranes provide DSSC with an optimum combination of short and long term performance, which may contribute to the commercial success of DSSC. |
