Solar RRL
·
2021
·Vol. 5
·期 10
·2100499
·
IF 8.582
Weiqiang Miao,Chuanhang Guo,Donghui Li,Teng Li,Pang Wang,Yujie Yang,Dan Liu,Tao Wang
Among the emerging photovoltaic technologies, organic and perovskite quantum dots (PQDs) solar cells have thrived on low-cost processing and extraordinary optoelectronic properties. Herein, CsPbBr 3 PQDs are incorporated into PM6:Y6-BO organic solar cell (OSC) to enhance device efficiency without scarifying the device stability. While the incorporation of PQDs has no impact on the molecular packing and phase separation of organic semiconductors, their presence enhances light absorption due to the Rayleigh scattering effect, promotes exciton dissociation in the Y6-BO phase, and forms an efficient hole transfer pathway from Y6-BO to PQDs and then to PM6 to improve hole transport. These contribute to increased short-circuit current density ( J SC ) and fill factor (FF) of OSCs with constant V OC . With the presence of 1 wt% CsPbBr 3 PQDs doping, the highest power conversion efficiency (PCE) of the corresponding PM6:Y6-BO OSC is improved from 16.4% to 17.1%, where the device stability has not been affected due to the better phase stability of CsPbBr 3 PQDs than CsPbI 3 PQDs. This work unravels a new approach to enhance the efficiency of OSCs by applying PQDs doping to manipulate the photon-to-electricity conversion process.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Huiling Zhang,Rongrong Yuan,Mengfeifei Jin,Zelong Zhang,Yanxia Yu,Weidong Xiang,Xiaojuan Liang
All-inorganic lead halide quantum dots (QDs) have attracted immense interest because of their excellent photoelectric properties. By virtue of a similar ionic radius and the same valence state, Rb + /Cs + mixed-cation have become a novel mechanism to adjust multi-color emission. However, their poor stability remains a serious problem that has not been solved satisfactorily. Interestingly, QDs glass shows good thermostability and moisture susceptibility. Herein, CsPbBr 3 : x Rb ( x = 0, 0.4, 0.6, 0.8) QD glasses which yield tunable emission spectra (475–523 nm) were synthesized successfully via glass crystallization. Most importantly, the as-prepared QDs glasses exhibited ultrastability under various atmospheric, water and heat conditions. Thus, synthesis of a mixed-cation perovskite QDs glass is a new method to achieve stable multi-color emission. They are also expected to become a new generation of photoelectric materials and can be prospectively applied to light-emitting devices.
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyue Liu,Zhiyong Liu,Xianhua Tan,Haibo Ye,Bo Sun,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
All-inorganic CsPbBr 3 is attracting tremendous attentions in photovoltaic field due to its superior stability. However, CsPbBr 3 perovskite always suffers from a poor crystallinity and film morphology. Many efforts have been paid on the CsBr deposition process to improve the film quality, while few attentions are paid on the crystallization kinetics of the PbBr 2 framework film. Here, we demonstrate a novel antisolvent-washing strategy for the PbBr 2 film for the first time to fabricate high-quality CsPbBr 3 film. This technique has a significant impact on the nucleation and growth of PbBr 2 crystals. As-prepared CsPbBr 3 films exhibit more homogeneous with higher crystallinity and coverage as well as larger grain sizes compared to those untreated ones. The best-performing antisolvent-treated perovskite solar cell achieves a scanned power conversion efficiency of 8.55%, which is an excellent efficiency for planar CsPbBr 3 cells reported yet. This enhancement can be mainly attributed to the more effective charge transport and suppressed non-radiative recombination caused by the reduced defect densities . Moreover, our devices show superb stability when stored in air for 1000 h and upon persistent thermal attack at 80 °C. Our work provides a new train of thought for controlling the growth dynamics and film morphology of CsPbBr 3 films.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jianming Liu,Shengnan Liu,Ya Chen,Qiliang Zhao,Yajuan Zhao,Weidong Xiang,Xiaojuan Liang,Baodong Ren
Since being synthesized, CsPbX 3 (X = Cl, Br or I) quantum dots (QDs) have gained increased interest due to their superior performances in photovoltaic applications. Herein, Sm 3+ -doped CsPbBr 3 nanocrystallines (NCs) were successfully prepared in zinc borosilicate sodium (ZnO–B 2 O 3 –SiO 2 –Na 2 CO 3 , ZBSN) glass, and the as-prepared glass exhibited a strong red emission, which was attributed to the effects of the energy level transitions in Sm 3+ . Importantly, white light-emitting diodes (W-LEDs) were prepared by combining the glass with a blue InGaN chip, eliminating the need for a red phosphor to provide the red light, and white light was generated with a high colour rendering index (CRI: 82.6), a low correlated colour temperature (CCT: 4455 K) and colour coordinates in the white light region (0.3547, 0.3234). The glasses show excellent stability at 85 °C and 85% RH. Therefore, the Sm 3+ -doped CsPbBr 3 NCs glass can be used as a colour converter for application in lighting engineering.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Jinze Lan,Liang Luo,Maomao Wang,Fan Li,Xiaoxia Wu,Fu Wang
CsPbX 3 (X = Cl, Br, I) perovskite colloids have attracted considerable attention because of their excellent optical properties , low-threshold lasing, and multicolor electroluminescence . Much work on synthesis and application of CsPbX 3 have been performed in the past several years. In this study, a novel robust one-pot synthesis method of CsPbBr 3 nanocrystals (NCs) was developed, in which all the precursors are heated together in a flask. Gram-scale CsPbBX 3 NCs with a fluorescence quantum yield of around 77% was achieved in a few minutes. A green light-emitting diode (LED) was fabricated by coasting CsPbBr 3 NCs on the surface of an industrially available blue chip. The fabricated LED emitted bright-green light with high color purity. This method provides a simple and efficient method for the large-scale preparation of high-quality CsPbBr 3 NCs, and might pave the way for their practical applications in green LEDs.
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Chaoqun Chen,Qing Cai,Fang Luo,Nuo Dong,Longhua Guo,Bin Qiu,Zhenyu Lin
The instability and insolubility of perovskite quantum dots in aqueous solution prohibit applications in polar solvents. As a highly toxic gas pollutant and also an endogenous gaseous signaling molecule existing in a variety of physiological processes, hydrogen sulfide (H2S), with high selectivity and high specificity, detection is of great significance. In this study, a simple device has been designed to separate H2S from aqueous solution and CsPbBr3 quantum dots (CsPbBr3 QDs) have been used as the detection probe to develop a novel fluorescent sensor for rapid H2S detection. The addition of hydrogen sulfide to the phosphoric acid solution results in the escape of H2S from the aqueous sample and hence it passing into the n-hexane solution containing CsPbBr3 QDs, resulting in the quenching of the fluorescence of CsPbBr3 QDs. The fluorescence intensity of the system has a linear relationship with the concentration of H2S in the range of 0–100 μM with the detection limit of 0.18 μM. The proposed system has been applied to detection of H2S in rat brain microdialysate with satisfying results. The potential mechanism regarding the quenching of fluorescence from CsPbBr3 QDs by H2S has been studied as well.
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 22
·1801015
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IF 4.834
Yang-Fan Xu,Xu-Dong Wang,Jin-Feng Liao,Bai-Xue Chen,Hong-Yan Chen,Dai-Bin Kuang
Artificially photocatalytic reduction of CO 2 into valuable chemicals, responding to the call of carbon neutral economy, has aroused considerable interests so far. Among those photocatalysts screened, an emerging and promising alternative of inorganic CsPbBr 3 perovskite has recently been reported. Here, to attain preferable photocatalytic performance, an amorphous-TiO 2 -encapsulated CsPbBr 3 nanocrystal (CsPbBr 3 NC/a-TiO 2 ) hybrid is demonstrated through a solution processing strategy. After optimizing the a-TiO 2 matrix amount by tuning the tetrabutyl titanate precursor volume, the CsPbBr 3 NC/a-TiO 2 composite exhibits a marvelous 6.5-fold improvement on the consumption of photoelectrons in photocatalytic CO 2 reduction reaction when compared with the individual CsPbBr 3 NC. Such significant enhancement is ascribed to the accelerated electron–hole separation and the multiplied CO 2 adsorption. Thus, as an available prototype, this work offers a rational encapsulation design for efficient halide perovskite photocatalyst.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 20
·5506-5513
·
IF 5.976
Meng Li,Xiao Zhang,Katarzyna Matras-Postolek,Hsueh-Shih Chen,Ping Yang
Fast and efficient ion-exchange reactions endow CsPbX3 nanocrystals (NCs) with superior photoluminescence (PL) properties. In this study, SnX2 (X = I, Cl) was used as a Sn precursor to conduct the cation exchange reaction, which was promoted by anion exchange between the parent CsPbBr3 NCs and the guest X in SnX2. The anion-driven cation exchange reaction occurred efficiently (10 min). CsSnI3 NCs were created by ion-exchange reactions between CsPbBr3 NCs and the SnI2 precursor. The CsSnI3 NCs retained the initial morphology of CsPbBr3 NCs and revealed a high PL efficiency (59%) and prolonged PL lifetime. In contrast, the exchange reaction of Sn2+ ions in CsPbBr3 NCs did not occur in a short time using SnBr2 as a precursor. After the cation exchange reaction, the 4f peaks of Pb ions in X-ray photoelectron spectroscopy spectra shifted to low binding energies as compared to those of the parent CsPbX3 NCs. This is ascribed to the increase in the number of Pb–oleate (Pb–OA) species. Contrary to the hot-injection method used to synthesize CsSnI3 NCs, the kinetically controlled ion exchange reactions lead to the synthesis of CsSnI3 NCs with a high structural stability. Thus, an anion-exchange-promoted cation exchange reaction is a particularly efficient versatile tool to dope Sn2+ into CsPbX3 NCs.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dong Wang,Xiao Zhang,Wenbin Shi,Ping Yang
Expanding light response is a significant approach to increase the harvesting efficiency of solar energy for photocatalysts. In this paper, aqueous CsPbBr 3 nanocrystals (NCs) were created using sol-gel glass as a reactor. These bright SiO 2 glass-coated NCs were decorated on hollow TiO 2 bowl array (TBN) via mechano-chemical pre-reaction and subsequent hydrothermal treatment for the first time to enhance the photocatalytic performance for NO removal. The homogeneous distribution of the NCs and the well-developed interface in type II CsPbBr 3 /TiO 2 heterostructures play important roles for improving the separation and transfer of photogenerated charge carriers. The light response of the CsPbBr 3 NCs increased the harvesting efficiency of solar energy. In addition, the bright photoluminescence of the CsPbBr 3 NCs was almost quenched to further confirm the separation of the photogenerated charge carriers in the heterostructures. Using optimized preparation conditions, the CsPbBr 3 /TiO 2 composite sample revealed an outstanding NO removal rate of 77.9 % at a concentration of 300 ppb, in which 45.2 % of NO was removed using pure TBN. In addition, the CsPbBr 3 /TiO 2 sample revealed excellent performance for photocatalytic H 2 O 2 evolution rate of 104.3 µM∙L −1 ∙h −1 , suggesting the CsPbBr 3 /TiO 2 composite can be applied for various photocatalytic fields. These results supplied new insights for the synthesis of photocatalysts and application of perovskite NCs.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Boyuan Yang,Wangshu Xu,Shu Tang,Wanfei Shi,Jingjing Dong,Hao Liu,Jie Xing,Huiying Hao
Stability is a crucial factor in the commercialization of perovskite solar cells (PSCs). CsPbBr3 PSCs, despite being less efficient than organic–inorganic hybrid PSCs, have a significant advantage in terms of stability. This makes them have promising potential for commercialization. In this study, high-quality all-inorganic CsPbBr3 perovskite films were prepared by using a multistep method in ambient air conditions. The crystalline quality of the CsPbBr3 films was improved by adding an appropriate amount of ammonium acetate (NH4Ac) to the PbBr2 precursor solution. Finally, carbon-based hole transport layer-free CsPbBr3 PSCs were fabricated by selecting NH4Ac-optimized light-absorbing layers and carbon electrodes that have a good commercialization prospect. Compared with control devices, the NH4Ac-optimized CsPbBr3 cell devices significantly improved in both efficiency and stability. The photoelectric conversion efficiency increased from 7.80% to 9.68%. This study provides an effective strategy for the preparation of high-quality films by using a multistep method and is also of great significance in promoting the commercialization of PSCs.
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Light-Science & Applications
·
2024
·Vol. 13
·期 1
·1-11
·
IF 20.6
Liu Guangyou,Wu Xinzao,Xiong Feng,Yang Jinglan,Liu Yunhe,Liu Jie,Li Zhuohang,Qin Zong,Deng Shaozhi,Yang Bo-Ru
Traditional optical anti-counterfeiting (AC) is achieved by static printed images, which makes them susceptible to lower levels of security and easier replication. Therefore, it is essential to develop AC device with dynamic modulation for higher security. Electrophoretic display (EPD) has the advantages of low power consumption, high ambient contrast ratio, and capability of showing dynamic images which is suitable for dynamic AC applications. Herein, we prepared a dynamical AC device based on a fluorescent EPD, and achieving the image switch between black, white, and green fluorescence states under the dual-mode driving (electronic field and UV light). We loaded perovskite quantum dots (CsPbBr 3 ) onto the TiO 2 particles and further prepared fluorescent electrophoretic particles TiO 2 /CsPbBr 3 -3-PLMA (TiO/CPB-3) by grafting and polymerizing method. In addition, we fabricated the AC devices based on the fluorescent EPD, which exhibits the multifunctional AC, where the fluorescent EPD has a fast response time of 350 ms, a high contrast ratio of 17, and bright green fluorescence. This prototype demonstrates a new way for future dynamic AC and identification.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Kaixiang Cui,Yong Chen,Keyu Xie,Haonan Peng,Liping Ding,Yu Fang
The integration of metal halide perovskite quantum dots (PQDs) into sensing technologies has been hindered by challenges in balancing environmental stability and sensing sensitivity. In this work, mesoporous silica nanoparticles (MSNs) with tunable pore sizes were employed as nanoconfinement reactors to synthesize size-controlled CsPbBr3 PQDs (3.0–12.0 nm). The nanoconfined environment facilitated the selective growth of pure CsPbBr3 phases, avoiding unwanted Cs4PbBr6 formation. The resulting nanoconfined PQDs, CsPbBr3@MSN, exhibited tunable emission from blue to green (470 to 515 nm), a high quantum yield (36.8%), and enhanced stability. Moreover, the PQD composites demonstrated exceptional performance in detecting the pesticide dicloran, achieving a detection limit of 0.16 μM, far below China’s national standard requirement (34.0 μM). The detection mechanism involved competitive adsorption and phase transitions from the cubic CsPbBr3 phase to the quasi-2D CsPb2Br5 phase. The porous MSN structure maintained efficient mass and energy transfer, ensuring both stability and sensitivity. Beyond sensing, these nanocomposites show potential for applications in anticounterfeiting and fingerprint recognition. This study highlights nanoconfinement as a powerful strategy for developing robust, high-performance PQD-based fluorescent sensors.
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