| 초록 |
The power conversion efficiency (PCE) of perovskite solar cells has risen to over 20% within last three years since the start of their development. Most of research on perovskite solar cell has focused on the improvement in PCE and the long-term stability. If one can easily refurbish the perovskite solar cells, the long-term stability may not be a critical issue. Also, from view point of environmental and cost-effective issue, if the failed perovskite solar cells are collected and recycled, the toxic chemicals such as Pb2+ ions cannot be spilled and reusing of gold electrode and transparent conducting glasses (TCG) can lead to reduce the price per watt of perovskite solar cells. Herein, we present a simple and effective method to remove the perovskite layer and reuse the expensive mesoporous (mp) TiO2 coated TCG substrates as well as gold electrodes. We found that the trihalide perovskite layer was easily decomposed in polar aprotic solvents. Due to the easy decomposition, we could collect the gold electrodes and regenerate the mp-TiO2 coated TCG substrates. We investigated the decomposition behavior of perovskite layer in various solvents including non-polar, polar-protic, and polar-aprotic solvents and discussed about the dissociation mechanism of perovskite materials with an aid of 13C nuclear magnetic resonance (NMR) study. Eventually, the 10 times of recycling process of solar cells showed the constant PCE, which demonstrates that the perovskite solar cells can be recycled. We strongly believe that this work will be a significant step forward in the commercialization of perovskite solar cells. |
