| 초록 |
Considering that a high compatibility at hybrid organic/inorganic interfaces can be achieved using polar and hydrophilic functionalities, this approach is used to improve inverted polymer solar cell performance by introducing nonionic phosphonate side chains into a series of isoindigo-based polymers (PIIGDT-Pn ). This approach led to ≈20% improvement in power conversion efficiency compared to a nonmodified control polymer, via an increased short-circuit current ( JSC ). This enhancement is believed to stem from reduced nongerminate recombination and improved charge carried extraction. These results are substantiated by a combination of detailed electrical measurements including space-charged limited current modeling, light intensity–dependent photocurrent ( Jph ) analysis, and morphological studies (GIWAXS and AFM). This is the first practical report demonstrating the use of nonionic polar side chains to control charge carrier dynamics in an existing photovoltaic polymer structure. |
