Recently, organic metal halide perovskites have attracted wide attention in the field of photovoltaic devices due to series of excellent photoelectric properties. However, the device performance is limited by a large number of surface defects in the perovskite film. Finding an effective method for defect passivation of perovskite film is considered to be a preferred strategy to further improve the performance of perovskite photovoltaic devices. Here, we use an organic metal salt, sodium alginate (SA), to passivate the surface defects of perovskite films to prepare high-performance perovskite photodetectors (PePDs). We find that the introduction of SA can improve the quality of perovskite active layer and passivate the surface defects effectively, which reduce the carrier recombination probability to increase the photocurrent and reduce the dark current of the PePDs. And the detectivity (D*) at 600 nm reaches 3.6×1012 Jones, three times that of the controlled devices. Meanwhile, the PePDs doped with sodium alginate have better stability and device life, which remains 82% of the original performance after being placed in the atmosphere for 7 days. These results indicate that it is an effective strategy to passivate perovskite film with organic metal salt to prepare high-performance PePDs.
Laser projectors are more and more widely used because of their large screen, and high brightness. However, the stray light outside the screen affects the user's viewing effect dramatically. In some cases, it looks like there's a halo on the top, or loos like some light outside the picture in the black. Since the stray light comes from the reflection of mechanical structural parts in the lens, and some stray light is launched by the light on digital micromirror device (DMD) off state in the illumination system, how to carry out theoretical analysis effectively is a difficult problem. On the other hand, how to trace stray light back to the source after it hits the screen and reduce it is also a challenge. Herein, some effective theoretic analysis methods and practical analysis methods are put forward, and effective countermeasures are given. Through experiments, the stray light situation is effectively improved.
Recently, ternary semi-transparent organic photovoltaics (STOPVs) have developed rapidly due to their impressive application prospect in vegetable greenhouse, smart light window, and building-integrated solar cells. However, STOPVs have special requirements for the thickness of the active layer, which will affect the performance of the solar cells. Therefore, a new method developed to trade off device performance and average transmittance (AVT) are extremely important. Herein, we used an insulating polymer poly(N-vinylcarbazole) (PVK) as a color control agent to improve the AVT without changing the power conversion efficiency (PCE) of ternary STOPVs. Through mixing of PVK, the STOPVs show remarkable enhancement of the hole mobility and visible light transmittance, which leading the AVT of the device reaches 23.2% while maintaining the PCE over 14%. This method can effectively realize the preparation of high-performance neutral STOPVs, which is worthy of further promotion and research.
KEYWORDS: Polymers, Polymerization, Interfaces, Zinc oxide, Solar cells, Organic photovoltaics, Polymer thin films, Electrodes, Control systems, Solar energy
Electro-chemical polymerization has identified to be a facile and useful method for the preparation of electroactive and conducting polymer films, and capability of precise control of the film properties. With this strategy, a large number of conjugated polymers were developed as specific interface modification layers to meet the requirements from various electronic equipment. Here we report the synthesis of conjugated polymer film prepared by in situ electro-chemical polymerization as effective interface modification layer between ITO and ZnO in organic solar cells. By optimizing the polymerization potential to control accurately the thickness of conjugated polymer layer, the resulting devices show significantly enhancement of short-circuit current, with an optimized power conversion efficiency (PCE) of 14.9%. As a result, the reasonable interface modification strategy via electro-chemical polymerization seems to be able to bring a new design perspective for the development of high-performance organic solar cells.
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