| 초록 |
Colloidal Quantum Dot (CQD) have emerged as a promising photoactive material due to low production cost and solution processability. Recent advances in understanding the properties of CQDs and the operation issues improved the performance of CQD based photovoltaic devices (CQDPVs). In this work, room temperature solution-processed high-efficiency CQDPVs are developed by improving charge extraction properties at p-n heterojunctions. Two types of interfacial modification methods; 1) a conjugated polyelectrolyte, WPF-6-oxy-F, and 2) chemical modifier 1,2-ethanedithiol (EDT), were used for ZnO/PbS-CQD heterojunctions. All of the device parameters are improved as a result of the enhanced built-in potential and the reduced interfacial charge recombination at the heterojunction. Consequently, the power conversion efficiency of the CQDPVs reached to a certified power conversion efficiency (PCE) of 10.14% with decent air stability. |
