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Developing Lattice Matched ZnMgSe Shells on InZnP Quantum Dots for Phosphor Applications
摘要： Indium phosphide quantum dots (QDs) have drawn attention as alternatives to cadmium and lead based QDs that are currently used as phosphors in lamps and displays. The main drawbacks of InP QDs are, in general, a lower photoluminescence quantum yield (PLQY), a decreased color purity and poor chemical stability. In this research, we attempted to increase the PLQY and stability of indium phosphide QDs by developing lattice matched InP/MgSe core-shell nano-heterostructures. The choice of MgSe comes from the fact that, in theory, it has a near-perfect lattice match with InP, provided MgSe is grown in the zinc blende crystal structure, which can be achieved by alloying with zinc. To retain lattice matching we used Zn in both the core and the shell and we fabricated InZnP/ZnxMg1-xSe core/shell QDs. To identify the most suitable conditions for shell growth, we first developed a synthesis route to ZnxMg1-xSe nanocrystals (NCs) wherein Mg is effectively incorporated. Our optimized procedure was employed for the successful growth of ZnxMg1-xSe shells around In(Zn)P QDs. The corresponding core/shell systems exhibit PLQYs higher than those of the starting In(Zn)P QDs and, more importantly, a higher color purity upon increasing the Mg content. The results are discussed in the context of a reduced density of interface states upon using better lattice matched ZnxMg1-xSe shells.
关键词： MgSe,Quantum Dots,lattice matching,core-shell,InP,phosphor
更新于2025-09-23 15:19:57
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Realizing efficiency improvement of polymer solar cells by using multi-functional cascade electron transport layers
摘要： Contact property between metal oxide electron transport layer (ETL) and active layer is one of the key factors to the performance of polymer solar cells (PSCs). To achieve better lattice matching and fewer defects, indium trioxide (In2O3) and zinc oxide (ZnO) (In2O3/ZnO) were used as the inorganic composite ETL, combining with an organic material PCBM as interface layer to obtain homogeneous phase separation of the active layer. The resulting device demonstrates a high fill factor of 69.83% and power conversion efficiency of 9.036% for PTB7:PC71BM based PSCs. Moreover, the acceptor material of PCBM serving as interface layer can interact with donor material of active layer to promote the exciton dissociation. This study provides a new method to improve the performance of PSCs by using multi-functional cascade electron transport layers.
关键词： Lattice matching,Electron transfer,In2O3/ZnO/PCBM cascade layers,Acceptor,Light absorption
更新于2025-09-19 17:13:59
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Latticea??Matching Structurallya??Stable 1D@3D Perovskites toward Highly Efficient and Stable Solar Cells
摘要： The stability of perovskite solar cells (PSCs) has been identified to be the bottleneck toward their industrialization. With the aim of tackling this challenge, a 1D PbI2-bipyridine (BPy)(II) perovskite is fabricated, which is shown to be capable of in situ assembly of a 1D@3D perovskite that is promoted by a PbI2-dimethyl sulfoxide complex with a skeletal linear chain structure. The as-prepared 1D@3D perovskite is observed to demonstrate extremely high stability under external large electric fields in humid environments by means of an in situ characterization technique. This stability is associated with its well lattice-matching heterojunction structure between 1D and 3D heterojunction domains. Importantly, ion migration is alleviated through blocking of the ion-migration channels. Accordingly, the 1D@3D hybrid PSC shows a power conversion efficiency of 21.18% maintaining remarkably high long-term stability in the presence of water, illumination, and external electric fields. This rational design and microstructure study of 1D@3D perovskites provides a new paradigm that may enable higher efficiency and stability of PSCs.
关键词： lattice matching,structural reconstruction,perovskite solar cells,dimension controlling,long-term stability
更新于2025-09-19 17:13:59