| 초록 |
The use of a ternary blend as an active layer in a polymer photovoltaic (PPV) is one of several strategies for improving the power conversion efficiency (PCE) of a PPV. In this study, we fabricated a PPV using an immiscible ternary blend which is not commonly used and improved the PCE. The immiscible ternary blend is composed of one donor material, IDIC as a non-fullerene acceptor, and PC70BM as a fullerene acceptor. Binary blends such as POTz:IDIC and POTz:PC70BM showed a typical bicontinuous and uniform morphology. In the other hands, the ternary blends showed immiscible domains on the morphology. When small amount of PC70BM was added into the POTz:IDIC:PC70BM blend, the PC70BM formed small domains into the continuous POTz:IDIC phase like raisin bread. The immiscible PC70BM domains improved the electron mobility, resulting in an increased JSC and FF. In addition, the ternary blends with PC70BM domains showed enhanced long-term stability in light soaking test. |
