In this article we report on a semitransparent polymer solar cell (STPSC) with polymer: fullerene blends sandwiched between a bottom one-dimensional photonic crystal (1DPC) and a top solution-processed highly conductive PEDOT:PSS electrode for light harvesting. The photoelectric parameters of STPSCs are characterized by the measurements of doubleface optical transmittance, reflectance, absorption, J-V, EQE, IQE, average visible transmittance, CIE in conjunction with those of the theoretical calculations based on transfer matrix simulation. It reveals that the theoretical short-circuit current density (JSC) of 1DPC-STPSC is not sensitive to the active layer thickness due to the relatively weaker microcavity effect compared to that of the conventional opaque PSCs, making the large-area manufacturing process easier. However, it shows a stronger microcavity effect compared to the non-microcavity STPSCs, which is advantageous to light absorption in active blends in the strong absorption band while maintaining the visible light transmission in the weak absorption band. Power conversion efficiency of 5.20% and JSC of 12.25 mA cm -2 increased by 37% and 38% respectively when compared with those of the STPSCs without using 1DPC, which is the highest value ever reported for an inverted STPSC with a low-cost highly conductive PEDOT:PSS layer as the light-incident side.

The performance of simple one-step doctor-blading ITO-free inverted polymer solar cells is primarily influenced by the inherent interfacial buffer layer stratification purity rather than the fine donor/acceptor phase separation.

A facile method is reported which involves blending a conjugated electron-extraction polymer with photoactive materials to simplify the fabrication process.

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We present an investigation of deep-blue fluorescent polymer light-emitting diodes (PLEDs) with a novel functional 1,3,5-triazine core material (HQTZ) sandwiched between poly(3,4-ethylene dioxythiophene):poly(styrene sulfonic acid) layer and poly(vinylcarbazole) layer as a hole injection layer (HIL) without interface intermixing. Ultraviolet photoemission spectroscopy and Kelvin probe measurements were carried out to determine the change of anode work function influenced by the HQTZ modifier. The thin HQTZ layer can efficiently maximize the charge injection from anode to blue emitter and simultaneously enhance the hole mobility of HILs. The deep-blue device performance is remarkably improved with the maximum luminous efficiency of 4.50 cd/A enhanced by 80% and the maximum quantum efficiency of 4.93%, which is 1.8-fold higher than that of the conventional device without HQTZ layer, including a lower turn-on voltage of 3.7 V and comparable Commission Internationale de L'Eclairage coordinates of (0.16, 0.09). It is the highest efficiency ever reported to date for solution-processed deep-blue PLEDs based on the device structure of ITO/HILs/poly(9,9-dialkoxyphenyl-2,7-silafluorene)/CsF/AL. The results indicate that HQTZ based on 1,3,5-triazine core can be a promising candidate of interfacial materials for deep-blue fluorescent PLEDs.