講演情報
[PE1-002]Recovery of PbI2 from spent perovskite solar cells
○Hong Paul Wang1, M.-X. Zhuang1, J.-E. Chang1, Y.-L. Wei2, C.-J. Jou3 (1. National Cheng Kung University, 2. Tunghai University, 3. National Kaohsiung First University of Science and Technology)
The power conversion efficiency (PCE) for perovskite solar cells (PSCs) possessing advantages of high efficiency and low-cost have rapidly been increased from 3.8 to 22.1% in seven years. Perovskite exhibits outstanding light absorption, long life of excitation, tunable band gap energy and relative low cost has been considered to be the next generation solar cells. In general, the perovskite layer in a PSC is formed by the reaction of PbI2 with CH3NH3I. PbI2 may not be replaced by SnI2 that is more toxic than PbI2. Thus, recovery of PbI2 from spent PSCs is becoming of great importance. Experimentally, PbI2 can be extracted from spent PSCs by water. By XRD, the characteristic peak (2θ = 12.7o) of PbI2 in spent PSCs exists before water extraction and disappears after the treatment. With this approach, a conceptual process design for recovery of PbI2, TiO2, and FTO conducting glasses from spent PSCs was carried out. Clean FTO conducting glasses can be recovered by water extraction of the spent PSCs. After the solid and liquid filtration, two streams including the PbI2 aqueous solution and TiO2/carbon are separated. PbI2 can be dried by hot gas generated from steam reforming of carbon in the TiO2/carbon stream, and TiO2 can be recovered as well. In this simple process, water is to be recycled, and a small portion of makeup water is needed.