Matched energy level alignment is a key requirement for efficient organic devices such as organic light-emitting diodes, photovoltaics, and field-effect transistors. The effect of thermal stress/annealing on energy level alignment and related properties of the devices are less discussed compared to the extensively explored effect on morphology and corresponding device performance. Here all polymer solar cells (all-PSCs) are employed to study thermal annealing effects on energy level alignment and the corresponding effect on the device properties of the all-PSCs. It is found that optimized energy level alignment can be achieved by thermal annealing. An interface dipole layer at the donor/acceptor interface is introduced by energy level realignment that assists charge generation by reducing geminate recombination so that the voltage loss is dramatically reduced, improving the performance of the all-PSCs.

匹配的能级对齐是高效有机器件（例如有机发光二极管，光伏和场效应晶体管）的关键要求。与对形态和相应的器件性能的广泛探索的影响相比，热应力/退火对器件的能级对准和相关性能的影响很少讨论。在这里，所有聚合物太阳能电池（all-PSC）均用于研究热退火对能级对准的影响以及对all-PSC器件性能的相应影响。发现可以通过热退火实现优化的能级对准。