Interface engineering is widely employed to enhance the performance of formamidinium lead triiodide(FAPbI_(3))perovskite solar cells.In this study,six different FAPbI_(3)/PbX(X=S,Se and Te)heterostructures are constru...Interface engineering is widely employed to enhance the performance of formamidinium lead triiodide(FAPbI_(3))perovskite solar cells.In this study,six different FAPbI_(3)/PbX(X=S,Se and Te)heterostructures are constructed,including the PbI interface and I interface perovskite.In addition,the lead vacancies(V-Pb)and iodine vacancies(V-I)are designed at the perovskite interface.The results show that the PbI interface is more stable than I interface in the heterostructures.The PbX covering layer on the surface of the FAPbI_(3) perovskite stabilizes the perovskite octahedral structure by interface interactions and charge reconstruction that are beneficial to passivate perovskite interface defects and inhibit the phase transition.It shows that the PbTe covering layer exhibits the best passivation effect for lead vacancy defects,while PbS covering layer shows the best passivation effect for iodine vacancy defects.Additionally,appropriate structural stress can strengthen the thermal stability of defective perovskite.This work reveals the FAPbI_(3)/PbX interface engineering,and offers new insights into effectively passivating defects and improving the stability of FAPbI_(3).展开更多
为研究刺参热加工过程中体壁胶原蛋白的物性变化规律,利用原子力显微镜(atomic force microscopy,AFM)考察样品浓度、溶剂和热处理条件对刺参体壁酶促溶性胶原蛋白(pepsin-soluble collagen,PSC)溶液聚集状态的影响。结果表明:在乙酸缓...为研究刺参热加工过程中体壁胶原蛋白的物性变化规律,利用原子力显微镜(atomic force microscopy,AFM)考察样品浓度、溶剂和热处理条件对刺参体壁酶促溶性胶原蛋白(pepsin-soluble collagen,PSC)溶液聚集状态的影响。结果表明:在乙酸缓冲液(pH2.7)、PBS缓冲液(pH7.2)和超纯水中,海参体壁酶促溶性胶原蛋白均随着浓度的增大而逐渐开始自组装,并最终形成无规则的团状结构或者片状网络结构。但是,溶剂不同,其开始自组装所需要的胶原蛋白浓度也不同。随着加热温度的升高或加热时间的延长,刺参体壁酶促溶性胶原蛋白分子逐渐聚集成网络结构,但加热温度超过100℃或时间超过2 h后,其交联程度逐渐降低,网络结构逐渐消失。展开更多
基金Projects(51673214,62004225)supported by the National Natural Science Foundation of ChinaProject(2022YFB3803300)supported by the National Key Research and Development Program of ChinaProject(2024ZZTS0776)supported by the Key Innovation Project of Graduate of Central South University,China。
文摘Interface engineering is widely employed to enhance the performance of formamidinium lead triiodide(FAPbI_(3))perovskite solar cells.In this study,six different FAPbI_(3)/PbX(X=S,Se and Te)heterostructures are constructed,including the PbI interface and I interface perovskite.In addition,the lead vacancies(V-Pb)and iodine vacancies(V-I)are designed at the perovskite interface.The results show that the PbI interface is more stable than I interface in the heterostructures.The PbX covering layer on the surface of the FAPbI_(3) perovskite stabilizes the perovskite octahedral structure by interface interactions and charge reconstruction that are beneficial to passivate perovskite interface defects and inhibit the phase transition.It shows that the PbTe covering layer exhibits the best passivation effect for lead vacancy defects,while PbS covering layer shows the best passivation effect for iodine vacancy defects.Additionally,appropriate structural stress can strengthen the thermal stability of defective perovskite.This work reveals the FAPbI_(3)/PbX interface engineering,and offers new insights into effectively passivating defects and improving the stability of FAPbI_(3).
文摘为研究刺参热加工过程中体壁胶原蛋白的物性变化规律,利用原子力显微镜(atomic force microscopy,AFM)考察样品浓度、溶剂和热处理条件对刺参体壁酶促溶性胶原蛋白(pepsin-soluble collagen,PSC)溶液聚集状态的影响。结果表明:在乙酸缓冲液(pH2.7)、PBS缓冲液(pH7.2)和超纯水中,海参体壁酶促溶性胶原蛋白均随着浓度的增大而逐渐开始自组装,并最终形成无规则的团状结构或者片状网络结构。但是,溶剂不同,其开始自组装所需要的胶原蛋白浓度也不同。随着加热温度的升高或加热时间的延长,刺参体壁酶促溶性胶原蛋白分子逐渐聚集成网络结构,但加热温度超过100℃或时间超过2 h后,其交联程度逐渐降低,网络结构逐渐消失。
