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High-Efficiency Perovskite Quantum Dot Solar Cells Benefiting from a Conjugated Polymer-Quantum Dot Bulk Heterojunction Connecting Layer
摘要： In this work, we reported an efficient and universal method to fabricate perovskite quantum dot (PQD) solar cells with enhanced efficiency. Through dissolving optimal amount conjugated polymers in PQD matrix solution to fabricate a polymer-QD bulk heterojunction hybrid layer located at PQD/hole transporting layer (HTL) interfaces, the resultant solar cell devices exhibit significantly enhanced short-circuit current density and efficiency. In-depth characterizations indicate that adding optimal conjugated polymer into the PQD film can effectively reduce pin-holes, resulting in more efficient interfacial charge transfer and decreased carrier recombination loss. More importantly, it shows that the highest occupied molecular orbital (HOMO) energy level of the conjugated polymer is crucial for achieving improved carrier transport at the PQD/HTL interfaces. Through rational selection of conjugated polymers, we achieved the best power conversion efficiency of ~14% and 13.2% for CsPbI3 and FAPbI3 PQD based solar cells respectively, situating the forefront of all reported PQD solar cells. These findings would provide insights into well controlling the organic-inorganic interfaces to improve photovoltaic devices.
关键词： interfacial modification,solar cells,perovskite quantum dot,bulk heterojunction,conjugated polymer
更新于2025-09-23 15:21:01
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Photoluminescence Loss and Recovery of ?±-CsPbI3 Quantum Dots Originated from Chemical Equilibrium Shift of Oleylammonium
摘要： α-CsPbI3 perovskite quantum dots (PQDs) have great potentials in red-emitting LED and solar cell applications. However, their instability with quick photoluminescence loss with time greatly limits their development. In this study, we found that the nonluminous aged α-CsPbI3 PQDs instantly regained fluorescence emission after a surface treatment with trioctylphosphine. Meanwhile, this surface treatment also worked on fresh α-CsPbI3 PQDs to enhance photoluminescence emission. The structures and compositions of fresh and aged PQDs before and after surface treatment were analyzed in detail. We demonstrated that a surface chemical equilibrium shift mechanism involving oleylammonium led to the PL loss and recovery of α-CsPbI3 PQDs. This chemical equilibrium shift also played an important role in other PQD stabilities against long term storage, temperature, UV irradiation and ethanol, which were all significantly improved after treatment. The treated α-CsPbI3 PQDs were phase stable for more than 6 months. Oleic acid and oleylamine are common ligands used in PQD syntheses; this study shall promote the understanding of PQD surface chemistry and the preparation of stable α-CsPbI3 PQDs.
关键词： photoluminescence loss,oleylammonium,recovery,CsPbI3,Perovskite quantum dot
更新于2025-09-23 15:19:57
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Cu <sub/>12</sub> Sb <sub/>4</sub> S <sub/>13</sub> Quantum Dots with Ligand Exchange as Hole Transport Materials in All-Inorganic Perovskite CsPbI <sub/>3</sub> Quantum Dot Solar Cells
摘要： Perovskite solar cells (PSCs) have developed rapidly in the past ten years. However, they are faced with huge challenge on stability improvement because of the volatile organic component in light absorption and hole transporting layer. Herein, we fabricate all inorganic PSCs with the structure of FTO/c-TiO2/m-TiO2/CsPbI3 quantum dots (QDs)/Cu12Sb4S13 QDs/Au to improve device stability. To enhance the photovoltaic performance of PSCs, the surface oleylamine ligands of Cu12Sb4S13 QDs with 3-mercaptopropionic acid are exchanged, as the enhanced electronic coupling and reduced bandgap are realized after the ligands exchange. Cu12Sb4S13 QDs based PSCs exhibit a PCE of 10.02%, approaching to the Spiro-MeOTAD based PSCs (12.14%). A high short-circuit current density of 18.28 mA*cm-2 is achieved because of the enhanced light absorption and excellent hole extraction ability of Cu12Sb4S13 QDs. Moreover, Cu12Sb4S13 QDs based PSCs exhibit the improved long-term stability and retain 94% of their initial PCE after stored in ambient air after 360 h.
关键词： ligands exchange,hole transporting materials,photovoltaic efficiency,stability,Cu12Sb4S13 quantum dot,perovskite quantum dot solar cells
更新于2025-09-19 17:13:59
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P‐9.13: A Vertical Type Photodetector Based on All‐inorganic Perovskite Quantum Dots
摘要： In this work, the vertical type photodetector (PD) based on CsPbBr3 QDs with a structure of indium tin oxide (ITO)/ zinc oxide (ZnO)/ CsPbBr3 QDs/ Au is reported. In this device, the ZnO layer acts as a buffer layer, which can improve the uniformity and surface coverage of the CsPbBr3 QDs film to eliminate the current-leakage. As a result, the on/ off ratio, D* and rise time (decay time) of CsPbBr3/ZnO hybrid PD is measured to be 2.2x104, 1.06x1011 and 62ms (82ms) under low reverse bias. This work inspires the development of vertical type photodetectors based on the all-inorganic perovskite quantum dots.
关键词： ZnO,All-inorganic perovskite quantum dot,Vertical type photodetector
更新于2025-09-19 17:13:59
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Nanocrystalline structure control and tunable luminescent mechanism of Eu-doped CsPbBr3 quantum dots glass for WLED
摘要： As CsPbX3(Cl, Br, I) perovskite quantum dot glass has been widely reported, the discovery of next-generation perovskite luminescent materials has been challenged by doping rare earth activators with energy-level transition. In this work, we report a novel Eu-doped quantum dots glass material with tunable luminescence properties. The structure characteristic and tunable luminescent mechanism were investigated by combining X-ray diffraction, X-ray photoelectric spectroscopy, excitation and emission spectra. It is found that Eu ions replaced the lattice of Pb in CsPbBr3 quantum dots and formed CsEuBr3 quantum dots, which result in a blue emission. Meanwhile, a green emission comes from CsPbBr3 quantum dots, and a red emission originally comes from Eu3+ in glass matrix can also be observed by controlling the heat treatment temperature. A light-emitting diode is designed based on the prepared Eu doped quantum dots glass without doping any phosphors, and a warm-light with CCT at 4075k is obtained. The present work provides a new luminescence tunable design principle of europium doped quantum dots glass materials and could bring inspiration to the future exploration of rare earth ion-doped quantum dot glass material in the future.
关键词： WLED,CsEuBr3,tunable luminescence,Eu-doped,CsPbBr3,perovskite quantum dot glass
更新于2025-09-19 17:13:59
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Halogen Vacancies Enable Ligand‐Assisted Self‐Assembly of Perovskite Quantum Dots into Nanowires
摘要： Interest has been growing in defects of halide perovskites in view of their intimate connection with key material optoelectronic properties. In perovskite quantum dots (PQDs), the influence of defects is even more apparent than in their bulk counterparts. By combining experiment and theory, we report herein a halide-vacancy-driven, ligand-directed self-assembly process of CsPbBr3 PQDs. With the assistance of oleic acid and didodecyldimethylammonium sulfide, surface-Br-vacancy-rich CsPbBr3 PQDs self-assemble into nanowires (NWs) that are 20–60 nm in width and several millimeters in length. The NWs exhibit a sharp photoluminescence profile ( (cid:2) 18 nm full-width at-half-maximum) that peaks at 525 nm. Our findings provide insight into the defect-correlated dynamics of PQDs and defect-assisted fabrication of perovskite materials and devices.
关键词： self-assembly,perovskite quantum dot,halide vacancy,nanowire,CsPbBr3
更新于2025-09-19 17:13:59
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Perovskite Quantum Dot Solar Cells with 15.6% Efficiency and Improved Stability Enabled by an α-CsPbI <sub/>3</sub> /FAPbI <sub/>3</sub> Bilayer Structure
摘要： We developed lead halide perovskite quantum dot (QD) solar cells with a combinational absorbing layer based on stacked α-CsPbI3 and FAPbI3. α-CsPbI3 QDs, with a relatively wide bandgap of 1.75 eV, are not ideal for single-junction solar cells. We show that the absorption can be broadened by the introduction of another QD layer with a narrower bandgap like FAPbI3. The α-CsPbI3/FAPbI3 structure together with thermal annealing can improve the electrical coupling in the FAPbI3 layer and induce A-site cation exchange to develop a graded heterojunction for more efficient charge extraction. A highest power conversion efficiency of 15.6% and improved ambient stability have been achieved for the bilayer structured solar cells. More interestingly, the perovskite QDs provided a facile way to fabricate multiple layers and quantum junctions for optoelectronic applications via layer-by-layer deposition, which cannot be realized in solution-processed perovskite thin-film devices.
关键词： bilayer structure,perovskite quantum dot,ambient stability,solar cells,charge extraction,α-CsPbI3,FAPbI3
更新于2025-09-16 10:30:52
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A vertical structure photodetector based on all‐inorganic perovskite quantum dots
摘要： In this work, the vertical structure photodetector based on CsPbBr3 quantum dots (QDs) with a structure of indium tin oxide (ITO)/zinc oxide (ZnO)/CsPbBr3 QDs/Au is reported. In this device, CsPbBr3 QDs film works as the light‐harvesting layer, and ZnO QDs film acts as the electron transport channel, which can extract the electron efficiently and improve the quality of CsPbBr3 QDs film. As a result, the on/off ratio, detectivity and rise time (decay time) of CsPbBr3/ZnO hybrid photodetector are measured to be 2.4 × 106, 2.25 × 1011, and 62 milliseconds (82 ms) under 0‐V bias. This work inspires the development of vertical structure photodetectors based on the all‐inorganic perovskite QDs.
关键词： zno quantum dot,all‐inorganic perovskite quantum dot,vertical structure photodetector
更新于2025-09-11 14:15:04
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Impact of Host Composition, Co-doping or Tri-doping on Quantum Cutting Emission of Ytterbium in Halide Perovskite Quantum Dots and Solar Cells Applications
摘要： Recently, various lanthanide ions (Ln3+) have been successfully doped into perovskite quantum dots (PQDs) and quantum-cutting emission of 2F5/2-2F7/2 for Yb3+with measurable inner efficiency more than 100 % has been discovered, applied as the luminescent converter of solar cells, which has opened a new branch for the application of PQDs. In this work, to further improve the quantum-cutting efficiency of Yb3+, the co-doping and tri-doping methods were displayed to improve the quantum cutting emission of PQDs. The Yb3+-Ln3+ (Ln=Nd, Dy, Tb, Pr, Ce) pairs doped CsPbClxBryI3-x-y PQDs were fabricated, which all displayed excitonic emissions, narrow-band emission of Ln3+ ions and quantum cutting emission of Yb3+ ions. It was interesting to observe that Yb3+-Pr3+ as well as Yb3+-Ce3+ pairs could effectively sensitize the emission of Yb3+, owing to Pr3+ and Ce3+ ions offered intermediate energy states close to the exciton transition energy of the PQDs. After host composition optimization and tri-doping investigation, overall emissions with 173% photoluminescence quantum yield (PLQY) were obtained in the Yb3+-Pr3+-Ce3+ tri-doped CsPbClBr2 PQDs. Then, the tri-doped PQDs was designed as the down-converter for the CuIn1-xGaxSe2 (CIGS) as well as the silicon solar cells, which relatively leads to enhancement of power conversion efficiency (PCE) as high as ～ 20%. The modified CIGS was further employed to charging the smart mobile phone, which could largely shorten the charging time from 180 to 150 min. This finding is of great significant for expanding the application fields of the impurity doped PQDs.
关键词： CIGS solar cell,ytterbium doping,quantum cutting,tri-doping method,Perovskite quantum dot
更新于2025-09-11 14:15:04
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Halogen Vacancies Enable Ligand-Assisted Self-Assembly of Perovskite Quantum Dots into Nanowires
摘要： Interest has been growing in defects of halide perovskites in view of their intimate connection with key material optoelectronic properties. In perovskite quantum dots (PQDs), the influence of defects is even more apparent than in their bulk counterparts. By combining experiment and theory, we report herein a halide-vacancy-driven, ligand-directed self-assembly process of CsPbBr3 PQDs. With the assistance of oleic acid and didodecyldimethylammonium sulfide, surface-Br-vacancy-rich CsPbBr3 PQDs self-assemble into nanowires (NWs) that are 20–60 nm in width and several millimeters in length. The NWs exhibit a sharp photoluminescence profile ( (cid:2) 18 nm full-width at-half-maximum) that peaks at 525 nm. Our findings provide insight into the defect-correlated dynamics of PQDs and defect-assisted fabrication of perovskite materials and devices.
关键词： CsPbBr3,self-assembly,halide vacancy,nanowire,perovskite quantum dot
更新于2025-09-11 14:15:04