PSS/PEI/P3HT:ICBA/EG-PEDOT:PSS). The cells exhibit an open-circuit voltage of 0.84 V, a fill factor of 0.60, and a power conversion efficiency of 3.3% under 100 mW/cm(2) white light illumination.

Thick, uniform, easily processed, highly conductive polymer films are desirable as electrodes for solar cells as well as polymer capacitors. Here, a novel scalable strategy is developed to prepare highly conductive thick poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (HCT-PEDOT:PSS) films with layered structure that display a conductivity of 1400 S cm(-1) and a low sheet resistance of 0.59 ohm sq(-1). Organic solar cells with laminated HCT-PEDOT:PSS exhibit a performance comparable to the reference devices with vacuum-deposited Ag top electrodes. More importantly, the HCT-PEDOT:PSS film delivers a specific capacitance of 120 F g(-1) at a current density of 0.4 A g(-1). All-solid-state flexible symmetric supercapacitors with the HCT-PEDOT:PSS films display a high volumetric energy density of 6.80 mWh cm(-3) at a power density of 100 mW cm(-3) and 3.15 mWh cm(-3) at a very high power density of 16160 mW cm(-3) that outperforms previous reported solid-state supercapacitors based on PEDOT materials.

We demonstrate the first all-plastic multijunction solar cells that all layers are solution processed sequentially from organic synthetic inks, including the electrodes, charge-collecting layers, the active layers, and the charge-recombination layers connecting the multiple junctions. Additionally, to our knowledge, this is the first reported organic tandem solar cells can simultaneously have the advantages of vacuum-free, metal-free, highly flexible and high output voltage. The realization of the all-plastic multijunction solar cells is based on fine tuning of the conductivity of the charge-recombination layer (CRL) via modifying the PEDOT:PSS formulation and selecting the processing solvent of the polyethylenimine to avoid the patterning and shorts. These cells with high photovoltage have been shown to meet the requirements to power liquid-crystal displays, full-color light-emitting diodes under low-intensity light conditions. They could become very low-cost solutions for powering various portable and wearable electronic devices, including wireless sensors for the internet of things applications.Flexible all-plastic multijunction solar cells with high photovoltage have been demonstrated via optimizing the charge-recombination layer and shown to power portable electronics. AbstractLow-cost, light-weight and flexible power supply is highly desirable for portable electronic devices. All-plastic solar cells in which all layers are fabricated sequentially from organic synthetic inks could meet these requirements. Here, we report that fully solutionprocessed all-plastic multijunction solar cells can be easily fabricated layer by layer without the need of sophisticated patterning. The key for the high-yield fully solution-processed multijunction cells is the control and tuning of the conductivity of the charge-recombination layer of PEDOT:PSS/PEI. The all-plastic multijunction solar cells achieve PCE of 6.1±0.4%and a high open-circuit voltage of 5.37 V. These all-plastic multijunction solar cells are successfully used to drive liquid-crystal displays, full-color light-emitting diodes and for water splitting under different light illumination conditions.