講演情報
[17p-M_124-4]Ultrathin PbS Quantum Dot Interlayer Enables Enhanced Performance in Organic Solar Cells via Thickness-Dependent Charge Management
Takaya Niida1, 〇YUYAO WEI1, Yongge Yang1, Shuzi Hayase1, Qing Shen1 (1.The University of Electro-Communications, Japan)
キーワード：
Organic solar cells、PbS quantum dot、Interlayer
Organic solar cells (OSCs) attract attention for flexibility, light weightiness, and low-cost fabrication, yet their practical use is hindered by relatively low power conversion efficiency (PCE ~20.1%) compared to silicon counterparts (~26.1%) and poor long-term stability. A key limitation lies in the light absorption layer (AL) (e.g., PM6:Y6 blend), which shows insufficient absorption at short wavelengths, and the ZnO electron transport layer (ETL) undergoing photo-oxidation at the interface, causing recombination losses. To address these issues, we introduced a PbS quantum dot (QD) interlayer between the AL and ETL to enhance short-wavelength harvesting and suppress interfacial degradation, as figure 1 shown. By systematically varying its thickness (using PbS QD solution with different concentration: 0, 1, 2 and 10 mg/ml), we studied its impact on absorption and recombination.Figure 2 shows the photovoltaic performance of the OSCs without and with PbS QD interlayer. It is obvious that an ultrathin PbS QD interlayer (condition 2 and 3) markedly boosts the photovoltaic performance especially the short-circuit current density (jsc), whereas excessively thick layers (condition 4) impaired charge extraction balance and lowered efficiency. Champion device (condition 2) achieved pce = 16.57 %, which is increased by 7 % compared with the control device. Our work demonstrates that precise control of PbS QD interlayer thickness is an effective method to improve the performance of OSCs, paving the way for flexible, low-cost photovoltaics. We'll also pay attention on the device long-term stability in our future works.