| 초록 |
Emerging perovskite solar cells and their advanced flexible technologies get toward commercialization of renewable clean electrical power source. A delicate control of carrier dynamics in the perovskite device, including a balance of charge extraction rate and a transport/extraction efficiency, has decisive effect on hysteresis phenomenon and their power conversion efficiency. Perovskite solar cell embedding organic charge transport layers as an alternative to inorganic transport layer, which has slow carrier dynamics, have the various advantages of low-temperature process, fast carrier mobility and they do not show hysteresis problem. However, organic transport layer based perovskite device is very unstable in the atmosphere. In our group, we have fabricated stable and efficient perovskite solar cell, which are attributed to the excellent performance of bi-structured inorganic-organic electron transport layer. A ~20 nm of thin organic layer formed on the several nanometers of plasma enhanced atomic layer deposited-TiOx afford enhancing electron extraction property than only TiOx layer. In addition, the perovskite solar cells, incorporating organic layer between inorganic TiOx and perovskite layer demonstrate high stability compare to fully organic based perovskite solar cells. Moreover, all fabrication processes for perovskite solar cell are performed on the low-temperature, we realized flexible perovskite solar cells. These flexible devices shown high efficient that boost a world-class level without hysteresis due to the complementary effect of bi-structured transport layer. |
