Xiaoyan Gan,Junfeng Yu,Wenhui Zhao,Liling Guo,Hanxing Liu
This paper introduced new two dimensional (2D) benzylammonium (BZA) based perovskites incoorperated with hexamethylendiammonium (HDA) for solar cell application. The influence of HDA additive on the cystallinity, morphology, photoelectrical properties and stability of (BZA) 2 (MA) 2 Pb 3 I 10 (MA = CH 3 NH 3 + ) were investigated. Results showed that the incorporation of diamine cation into the Ruddlesden-Popper perovskite (BZA) 2 (MA) 2 Pb 3 I 10 was useful in improving its phase purity, surface roughness , conductivity and performances in perovskite solar cells . The 2D (BZA) 2 (MA) 2 Pb 3 I 10 perovskite films with HDA incorpation showed much enhanced moisture stability than its 3D perovskite counterpart MAPbI 3 . By optimizing the HDA concetration, an efficiency of 3.33% was obtained for mesostrucured (BZA) 2 (MA) 2 Pb 3 I 10 based perovskite cell, which is more than a time higher than that of (BZA) 2 (MA) 2 Pb 3 I 10 without HDA (1.59%). Our work emphasized the significance of material purity and quality for BZA based perovskite solar cells, demonstrating the validity of mixed amine cations in improving their photovoltaic performance .
Jie Cao,Junke Jiang,Nan Li,Yifan Dong,Yongheng Jia,Shuxia Tao,Ni Zhao
Two-step sequential deposition has been shown to be an effective method to improve the quality of perovskite films and performance of perovskite solar cells (PSCs). In this work, we have developed a two-step sequential deposition method, incorporating an alkali cation (e.g., Cs+) and a benzylammonium (BA+) cation into formamidinium (FA+)-based perovskite thin films for highly efficient and stable PSCs. By combining experimental characterization and theoretical calculations, we demonstrate that not only the co-incorporation of alkali cations and BA+ significantly improves the crystallinity and orientational growth of perovskite films, but also Cs+ enhances the passivation effect of BA+ ions on the perovskite surface via strengthening bonding between BA+ and perovskites. In particular, inclusion of Cs+ in BA+-passivated perovskites promotes the preferred orientation of defect-free (1 0 0) facets. As a result, we observed remarkable improvements in both open-circuit voltage and fill factor of formamidinium-benzylammonium-cesium (FABACs)-based PSCs, achieving a champion efficiency of 22.5%. More importantly, the FABAC perovskite films demonstrated superior resistance to humidity and photo-thermal stress, and the perovskite-based devices (without encapsulation) retained over 95% of the initial efficiency after exposure to air for 2 months. Manipulating the perovskite composition by combining small alkali and large organic cations in two-step sequential deposition provides an efficient and facile approach to realize highly efficient and stable perovskite devices.
Any sort of wound injury leads to the destruction of skin integrity and wound formation, causing millions of deaths every year and accounting for 10% of death rate insight into various diseases. The ideal biological wound dressings are expected to possess extraordinary mechanical characterization, cytocompatibility, adhesive properties, antibacterial properties, and conductivity of endogenous electric current to enhance the wound healing process. Recent studies have demonstrated that biomedical hydrogels can be used as typical wound dressings to accelerate the whole healing process due to them having a similar composition structure to skin, but they are also limited by ideal biocompatibility and stable mechanical properties. To extend the number of practical candidates in the field of wound healing, we designed a new structural zwitterion poly[3-(dimethyl(4-vinylbenzyl) ammonium) propyl sulfonate] (SVBA) into a poly-acrylamide network, with remarkable mechanical properties, stable rheological property, effective antibacterial properties, strong adsorption, high penetrability, and good electroactive properties. Both in vivo and in vitro evidence indicates biocompatibility, and strong healing efficiency, indicating that poly (AAm-co-SVBA) (PAS) hydrogels as new wound healing candidates with biomedical applications.
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