The photosynthesis of hydrogen peroxide (H2O2) from oxygen (O2) represents a promising catalytic pathway, the limited efficiency of the oxygen reduction constitutes a primary barrier to enhancing production. In this content, alkali metal potassium (K+) and Br-doped g-C3N4 photocatalysts (K-CN) were successfully constructed by one-pot method. The introduction of K+ is not only beneficial to the transmission of space charge and the separation efficiency of photogenerated carriers, but also promotes the efficient production of H2O2 by 2e- oxygen reduction reaction. The introduction of Br- promotes O2 converted to triplet state and triggers energy transfer process to increase 1O2 production, O2 adsorption was facilitated through regulating the oxygen evolution (O2→1O2), which is beneficial to the subsequent oxygen reduction process. The results showed that the H2O2 yield of 0.05 K-CN catalyst reached 26.0 mmol g-1 h-1, which was more than 5 times that of pure g-C3N4.
Wide-bandgap semitransparent perovskite photovoltaics are emerging as one of the ideal candidates for building-integrated photovoltaics (BIPV). However, surface defects in inorganic CsPbBr3 perovskite prepared by vapor deposition severely limit the optoelectronic performance of perovskite solar cells. To address this issue, a strategy of doping a trace amount of KBr into perovskite by vapor deposition is adopted, effectively improving the quality of the film, reducing surface defect concentration, and enhancing the transportation and extraction of charge carriers. Simultaneously, fully physical vapor deposition technology is employed to fabricate perovskite solar cells with an average visible light transmittance of 44%. These devices exhibited an ultrahigh open-circuit voltage of 1.55 V and a superior power conversion efficiency (PCE) of 7.28%, demonstrating excellent moisture and heat resistance. Moreover, the corresponding 5 cm × 5 cm modules achieve a PCE of 5.35% with great thermal insulation capability. This work provides an approach for fabricating highly efficient all-inorganic perovskite solar cells with high average visible light transmittance, demonstrating new insights into their application in building-integrated photovoltaics.
Yaning Luo,Yaning Luo,Lingmei Kong,Lingmei Kong,Lin Wang,Lin Wang,Shuanghe Guo,Xuyong Yang,Xuyong Yang
Perovskite light-emitting diodes (PeLEDs) are regarded as exceptional candidates for next-generation high-definition displays. Despite the fact that the all-inorganic perovskites possess an advantage in structural stability among the perovskite family, the electroluminescence (EL) performance of their corresponding PeLEDs are still challenged by the difficulties in depositing smooth, uniform perovskite films and realizing chare balance under working voltages. Here, we report an efficient and stable CsPbBr3 based PeLED, which is enabled by a hole transport layer (HTL) of KBr doped poly(3,4,-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The KBr dopant can not only improve the charge balance by boosting the hole injection, but also suppress the exciton quenching through passivating halide defects in perovskites. The resulting PeLED exhibits a maximum current efficiency (CE) of 35.09 cd A−1 and a maximum external quantum efficiency (EQE) of 10.02%, which are over 12-fold higher than those of the control device based on undoped HTL, respectively. Our work provides an easy and efficient strategy to boost the EL performance of all-inorganic perovskites.
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