Presentation Information
[9p-P06-28]Fundamental Research on Recovery Rate and Ultrasonic Irradiation Distance in Perovskite Material Recovery Using an Ultrasonic Homogenizer
〇Mii Ishida1, Nao Saito1, Tomoyuki Tobe2, Tsutomu Miyasaka1,3, Yoshihiko Suda3, Masashi Ikegami1 (1.Toin Univ. of Yokohama, 2.KISTEC, 3.Peccell Technologies)
Keywords:
Ultrasonic,Lead Recovery,Iodine Recovery
To realize the practical application of perovskite solar cells, the development of recycling technologies is urgently needed. The photoactive layer of high-efficiency perovskite solar cells typically consists of lead halide perovskites such as CH3NH3Pbl3. Since lead is a regulated substance under the RoHS Directive, appropriate usage and management systems are essential. Although Japan has abundant iodine reserves, issues related to groundwater usage in production areas make iodine recovery equally important. Perovskite layers can be separated from film substrates after peeling off the barrier film and applying ultrasonic irradiation in water, which disperses or dissolves the perovskite components. Changing the pH of water can enhance this removal, but conditions that allow separation in pure distilled water are desirable due to simplified recycling process.In this study, 25 mm-square perovskite solar cell films were immersed horizontally in distilled water. Ultrasonic irradiation (20kHz, 38W) was applied using a homogenizer in a sequence of ON 1s→OFF 2s→ON 1s. The horn-to-substrate distance was varied in 10mm. A removal rate of 80% was achieved at 10mm, while 30-50mm yielded an average of 35.3± 1.2%.These results provide insights into optimal horn distance, number, and positioning for efficient perovskite removal.