The large voltage loss (Vloss) mainly stems from the mismatch between the perovskite film and electron transport layer in CsPbI2Br-based all-inorganic perovskite solar cells (I-PSCs), which restricts the power conversion efficiency (PCE) of devices. To address this issue, potassium benzoate (BAP) is first introduced as a bifunctional passivation material to regulate the TiO2/CsPbI2Br interface, reduce the Vloss, and improve the photovoltaic performance of CsPbI2Br-based I-PSCs. Eventually, the champion PCE of CsPbI2Br-based I-PSCs without a hole transport layer modified by BAP (Target-PSCs) improves to 14.90% from the 12.14% of reference PSCs. The open-circuit voltage (Voc) increases to 1.27 V from the initial 1.14 V after BAP modification. A series of characterizations show that BAP modification can not only optimize the energy level alignment of I-PSCs but also passivize the surface defects caused by uncoordinated Cs+/Pb2+. Moreover, the Target-PSCs without encapsulation demonstrate better thermal stability, which can maintain 107.6% of the original PCE after annealing at 160 °C for 140 min in humid air. While the reference PSCs only maintain 76.5% of their initial PCE after annealing at the same process. This work provides a simple strategy to modify the buried interface and improve the performance of CsPbI2Br-based I-PSCs.
Fishy odorants substantially impair the flavor and quality of aquatic products, creating an urgent need for safe and effective deodorization methods. Herein, potassium benzoate-cyclodextrin metal-organic frameworks (PB-CD-MOFs) with multi-dimensional cavities was formulated to remove fishy odorants (2,4-decadienal, 4-heptenal, and nonanal). And the underlying adsorption mechanism of PB-CD-MOFs for fishy odorants was clarified by adsorption kinetics, isotherms, thermodynamics, and density functional theory (DFT) calculations. Based on the Single-crystal X-ray diffraction (SCXRD) analysis, PB-CD-MOFs possessed a multi-dimensional cavity structure featuring two distinct pore channels. The larger pores (9.5 Å) were from the cavities of γ-CD, while the smaller pores (7.8 Å) were formed through the self-assembly of PB and γ-CD. Compared with γ-CD, PB-CD-MOFs showed fourfold adsorption capacity, probably due to its multi-dimensional pores. Meanwhile, PB-CD-MOFs exhibited excellent adsorption capacities for 2,4-decadienal, 4-heptenal, and nonanal (238.55, 196.91, and 213.88 mg/g), which can be attributed to aldehydes entering the multi-dimensional pore channels and binding to active sites on the pore walls, as evidenced by DFT calculations. The adsorption process followed the pseudo-first-order kinetic model, indicating physisorption. According to the adsorption isotherms of Langmuir, Freundlich, and Redlich-Peterson, PB-CD-MOFs underwent multi-layered heterogeneous adsorption. Thermodynamic and DFT analysis illustrated that the adsorption was a spontaneously exothermic reaction and also revealed that hydrogen bonding and van der Waals forces were the principal driving forces for aldehyde adsorption by PB-CD-MOFs. The research offers a new approach to remove fishy odorants, elucidates the related mechanism, and facilitates broader application of CD-MOFs in the food industry.
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