Catalysts
·
2023
·Vol. 13
·期 7
·1048
·
IF 3.9
Wanli Liu,Jinfeng Liu,Xiaoqian Wang,Jiazhen He,Yuqing Li,Yong Liu
Practical applications of CsPbX3nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and photocatalytic properties of the core/shell perovskite is very important for its application in photoelectric and photocatalytic technology. Here, we report the synthesis of asymmetrical CsPbBr3/TiO2core–shell heterostructure NCs at the single-particle level by hot-injection liquid-phase synthesis and sol–gel method, where each CsPbBr3NCs is partially covered by titanium dioxide. We tested not only the optical properties of the material but also the electrochemical impedance and photocurrent density of the material in sodium sulfate solution. It is shown that the type II arrangement is generated at the heterogeneous interface, which greatly facilitates the separation of electron–hole pairs and increases the carrier transport efficiency. Compared with CsPbBr3NCs, CsPbBr3/TiO2has higher photocatalytic efficiency. More crucially, due to the protection of the titanium dioxide shell, the product has higher long-term stability in humid air compared with bare CsPbBr3NCs. The asymmetrical core–shell heterostructure prepared in this study not only improves the stability of CsPbX3NCs but also provides some ideas for optoelectronic device applications and TiO2-based photocatalysts.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaofeng Lai,Song Wang,Ying Xie,Binghang Liu,Jianhui Sun,Yuxin Li,Haitao Yu,Kai Pan
CsPbBr3 perovskite nanocrystals have emerged as promising candidates for photocatalysis. However, their conversion efficiency is hampered by material instability, and the accumulation of deactivated perovskites produced after photocatalytic reactions raises significant environmental concerns. To address this issue, we developed a mechanochemical grinding approach assisted by oleylamine as an additive to restore the optical properties and photocatalytic activity of deactivated CsPbBr3, which was due to aggregation in the photocatalytic CO2 reduction reaction. Upon regeneration, the CsPbBr3 nanocrystals exhibited an average length of 34.21 nm and an average width of 20.86 nm, demonstrating optical properties comparable to those of the pristine CsPbBr3 nanocrystals. Moreover, they achieved a conversion efficiency of 88.7% compared with pristine CsPbBr3 nanocrystals in the photocatalytic CO2 reduction reaction. This method effectively enhanced the utilization of CsPbBr3, offering a novel approach for the recycling and recovery of perovskite materials and thereby minimizing material waste and environmental pollution.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 32
·24895-24905
·
IF 2.779
Liu Chao,Chen Hang,Lin Ping,Hu Haihua,Meng Qingyu,Xu Lingbo,Wang Peng,Wu Xiaoping,Cui Can
CsPbBr 3 emerges as a representative inorganic perovskite due to its feasible synthesis and outstanding properties. In this work, high-quality orthorhombic and cubic CsPbBr 3 single crystals (SCs) are successfully grown by a modified inverse temperature crystallization method. Current–voltage ( I – V ) and current–time ( I – t ) curves were systematically measured under various biases and light illumination intensities to investigate the correlation between the photoelectrical properties and the crystal structures. Even though the cubic CsPbBr 3 has a larger averaged carrier lifetime than those of the orthorhombic CsPbBr 3 crystal, extremely asymmetry in the I–V curves and abnormal hysteresis behaviors are observed in cubic CsPbBr 3 , and an overshoot followed by a slow decay in the photocurrent becomes more pronounced in cubic CsPbBr 3 as light illumination intensity increases, reflecting the significant effect of ion migration in the photoelectric performance in cubic CsPbBr 3 . On the other hand, the photocurrent in orthorhombic CsPbBr 3 exhibits excellent response ability and stability, showing a large light-to-dark ratio of 15.2, roughly 7 times larger than cubic CsPbBr 3 . The differences in the photoelectrical properties between cubic and orthorhombic CsPbBr 3 provide insights into the influence of crystal structure on the photoelectronic properties of perovskite materials.
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Advanced Materials Technologies
·
2022
·Vol. 7
·期 9
·2200131
·
IF 8.856
Jinfeng Xie,Linzhong Wu,Muhan Cao,Qixuan Zhong,Ying Zeng,Chuanxin Ni,Qingyi Qian,Xiaohong Zhang,He Huang
1D APbX 3 (A = Cs, MA, FA, X = Cl, Br, I) nanorods (NRs) show potential for the future integrated optoelectronic devices as the ideal building blocks due to their outstanding optoelectronic performances. However, there is still a lack of high-efficiency controllable strategies to synthesize CsPbX 3 NRs. An interfacial synthesis strategy is shown here to fabricate CsPbBr 3 NRs by inserting Pb 2+ into postsynthetic CsBr nanocrystals in vortex method at the water-hexane interface. The water phase can intrinsically separate from the hexane phase in such a system and take away excess Pb 2+ and other side reaction salts. Additionally, without additional ligand assisted growth, the whole reaction system could result in a very clean surface of CsPbBr 3 NRs, eliminating the further purification process. The new approach for interfacial synthesis paves the way for efficient synthesis of CsPbBr 3 nanorods.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Xiaoyan Li,Meili Yang,Shaochuan Hou,Jiahao Yan,Jingjing Dong,Li Zou,Jie Xing,Hao Liu,Huiying Hao
Although CsPbBr 3 perovskite solar cells (PSCs) have excellent thermal and humidity stability, the narrow spectral absorption range and severe charge recombination within the CsPbBr 3 film and device interfaces result in a low power conversion efficiency (PCE). In this work, self-synthesized graphene quantum dots (GQDs) and poly(3-hexylthiophene) (P3HT) are introduced to modify the m-TiO 2 /CsPbBr 3 and CsPbBr 3 /carbon interfaces of CsPbBr 3 PSCs, respectively. It is found that the carrier extraction and transfer are improved enormously after GQDs and P3HT dual modifications, which can be attributed to the passivated trap states, suppressed charge recombination, and reduced the interfacial energy barrier. Ultimately, for the carbon-based CsPbBr 3 PSCs, a champion PCE as high as 9.74% with outstanding short-circuit current density (J SC ) of 9.36 mA cm -2 and open-circuit voltage (V OC ) of 1.42 V has been achieved, and the device stability has also been improved greatly. Such a strategy contributes to improving the performance of CsPbBr 3 PSCs.
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RSC Advances
·
2022
·Vol. 12
·期 5
·2729-2735
·
IF 4.036
Jie Zhang,Jiaojiao Liu
In this study, CsPbBr3 particles were prepared by a simple solvent evaporation method in ambient environment; the p–n heterojunction formed by CsPbBr3 particles on the surface of a single long Te wire was used to construct a high-performance Te/CsPbBr3 photodetector. Compared with CsPbBr3 PDs, the Te/CsPbBr3 photodetector showed improved photocurrent, and exhibited characteristics of excellent self-powered performance, broad-spectrum response (UV-visible), and ultra-fast response speed (trise = 0.09 ms). In addition, under zero bias and upon 540 nm light irradiation, the device had good responsivity (0.35 mA W−1), high photosensitivity (up to 100 on/off ratio), and a detectivity of 1.42 × 1010 Jones. This study provides insight into the possibility of manufacturing high-performance self-powered photodetectors through a simple in situ construction of heterojunctions.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wei Shen,Ye Yu,Wenzhu Zhang,Yanfeng Chen,Jianbin Zhang,Liu Yang,Jingting Feng,Gang Cheng,Lihui Liu,Shufen Chen
Exploitation of next-generation blue light-emitting diodes (LEDs) is the foundation of the revolution in lighting and display devices. Development of high-performance blue perovskite LEDs is still challenging. Herein, 4-aminobenzenesulfonic acid (SA) is introduced to passivate blue CsPbBr3 nanoplates (NPLs), reducing the ionic migration via a more stable Pb2+–SO3–– formation, and the trap state density of films shows a 50% reduction. The inevitable Br– vacancy defects after the multistep washing process can be suppressed by a suitable MABr treatment, which can boost the external quantum efficiency (EQE) performance. It should be noted that the coverage of NPL films is another key factor to realize reproducible pure blue electroluminescence (EL). Therefore, we proposed an alternate droplet/spin coating method to improve the coverage and thickness of NPL layer to prevent hole transport layer emission and increase the reproducibility of LED performance and spectra. Furthermore, we designed hole transport layers to decrease the hole transport barrier and improve the energy-level alignment. According to SA passivation, MABr treatment, alternate droplet/spin coating method, and device structure optimization, a CsPbBr3 NPL-based pure blue (0.138, 0.046) LED with 3.18% maximum EQE can be achieved, and the half-lifetime of EL can be enhanced 1.71 times as compared to that of the counterpart LED without SA. Both performance and stability of pure blue NPL LEDs can be greatly improved via ligand passivation, alternate droplet/spin coating method, and device structure optimization, which is a trend to promote the development of pure blue perovskite LEDs in future.
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Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 1
·301-310
·
IF 6.4
Hui Zhang,Feifei Cai,Bo Huang,Huichao Zhang,Shitong Li
Due to the unique structural and optical anisotropy, colloidal quasi-two-dimensional nanoplatelets (NPLs) have been proposed as an important material platform for realizing quantum information technology. However, the optical and structural instability of emerging perovskite NPLs after rapid dilution is preventing such studies, along with an unknown intermediate evolution process. Herein, we investigate the photoluminescence evolution of CsPbBr3 NPLs during stepwise dilutions. Upon decreasing the concentration, a red shift of the emission peak can be observed in CsPbBr3 NPLs with different thicknesses and synthesis methods. The dilution ripening mechanism dominates this red-shifted photoluminescence, in which larger NPLs capture monomers when smaller NPLs are dissolved, and then the accumulated monomers increase the lateral size and thickness of large NPLs. Interestingly, the simple aging treatment can help improve the dilution stability of thicker NPLs of the hot-injection method. Moreover, it is confirmed that the dilution ripening effect can be suppressed by introducing PbBr2-saturated solution or exchanging pristine ligands with stronger binding ligands such as lecithin.
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ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Li Xiang,Xuekai Huang,Ya Wang,Zhilong Xin,Gaoda Chai,Yangbing Xu,Kai Wang,Jun Chen,Chuan Liu,Xinwei Wang,Shengdong Zhang,Hang Zhou
X-ray detection is an important technology for medical diagnosis as well as industrial and security inspections. While today's commercial X-ray detectors are bulky, photodetectors based on organic semiconductors have attracted increasing attention owing to their low temperature processing capabilities, flexibility and low cost. Nonetheless, the low X-ray attenuation coefficient of organic semiconductors still hinders their practical application. Herein, a new organic-inorganic hybrid strategy is proposed to improve the X-ray sensitivity of organic photodetectors (OPDs). A solution-processed X-ray sensitive hybrid OPD is fabricated by embedding CsPbBr 3 quantum dots (QDs) into a P3HT:PC 61 BM bulk heterojunction photodiode . The QDs, acting as embedded scintillators in the organic active layer, maintain a high radioluminescence . The proposed hybrid structure enables indirect X-ray detection in a comprehensive manner. These hybrid photodetectors exhibit suppressed dark current densities in the range of tens of picoamperes per square centimeters for different weight ratios of blended QDs. The best OPD achieves a sensitivity of 229.6 e nGy −1 mm −2 (3.67 μC Gy −1 cm −2 ) and a dark current of 23.3 pA cm −2 at a low operating voltage (−3 V) for 20–80 kV “soft” X-rays, thus representing great potential for the development of next generation low cost, portable, and highly sensitive X-ray detectors.
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RSC Advances
·
2021
·Vol. 11
·期 6
·3380-3389
·
IF 3.361
Mukerem Helil Abib,Junchun Li,Heming Yang,Man Wang,Taotao Chen,EnzeXu,Yang Jiang
All inorganic carbon-based planar perovskites, particularly CsPbBr3, have attracted considerable attention due to their excellent stability against oxygen, moisture, and heat for photovoltaic utilization. However, the power conversion efficiency of carbon-based planar CsPbBr3 perovskite solar cells is mostly low, primarily because of the inferior film quality with undesirable crystallization and narrow light absorbance ranges. Herein, we develop a novel direct deposition approach combined with Sn doping to achieve highly efficient and stable carbon-based Sn-doped CsPbBr3 perovskite solar cells. Mass-scale Sn ion-doped CsPbBr3 perovskite powder was effectively synthesized and characterized via a facile strategy by adding hydrohalic acid in the CsBr, PbBr2 and SnBr2 precursor in a dimethyl sulfoxide solution. Moreover, using the as-synthesized CsPbBr3 and Sn-doped CsPbBr3 perovskite powder, PSCs were obtained via effective direct thermal evaporation. A smooth, constant and pinhole-free perovskite film was achieved with a configuration of FTO/TiO2/Sn:CsPbBr3/carbon. PSCs based on Sn:CsPbBr3 as an absorber and carbon as the HTM achieved an impressive power conversion efficiency of 8.95% compared to 6.87% for undoped CsPbBr3; moreover, it displayed admirable stability in an open-air atmosphere for an operational period of about 720 h without a noticeable negative result. The introduction of the Sn ion may advance the interface extraction of charge between the electric transport layer to the absorber layer and absorber to the carbon electrode. Accordingly, the Sn ion doping on CsPbBr3 during the synthesis phase and the direct evaporation paves a novel approach for intended photovoltaic applications.
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Solar RRL
·
2020
·Vol. 4
·期 11
·2000390
·
IF 7.527
Santhosh Kumar Karunakaran,Gowri Manohari Arumugam,Wentao Yang,Sijie Ge,Saqib Nawaz Khan,Yaohua Mai,Xianzhong Lin,Guowei Yang
All-inorganic perovskite of CsPbBr 3 thin-films solar cells has attracted increasing interest in recent years due to its potential long-term stability over the generally used hybrid perovskites. Herein, all-inorganic CsPbBr 3 perovskites are doped with Eu 2+ to enhance the efficiency of perovskite solar cells (PVSCs). The perovskite films exhibit a better crystallinity with smooth morphology after the introduction of rare-earth elements. Hence, the hole-transport layer-free device with presence of Eu 2+ and low-cost carbon electrode achieves both enhanced efficiency and stability. In particular, the power conversion efficiency (PCE) enhances from 5.66% to 7.28% with high V OC of 1.45 V by optimizing the doping concentration of Eu 2+ . In addition, the storage stability measurements reveal excellent performances of PCE without encapsulation in air with relative humidity of 70–80%. These results can pave changes in future inorganic PVSCs.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 40
·17368-17373
·
IF 3.288
Fang Guo,Yu-Yue Wang,Jie Zhang,Xiao-Lan Wei,Zhi-Hong Mo
Colloidal cesium lead bromide perovskite nanocrystals (CsPbBr3 PNCs) were synthesized using cyclodextrins (CDs) as a sole ligand at room-temperature. Compared to the conventional synthesis using the combinatorial ligand of oleic acid and oleylamine, the α-CD-mediated synthesis yielded PNCs with a greater productivity, a higher photoluminescence quantum yield (85%), and longer resistances to moisture, heat and laser irradiation. The reason for this phenomenon arises from strong interactions between the CD hydroxyl groups and the perovskite metal ions. Using the non-toxic and low-cost CDs, the synthesis of colloidal PNCs is more economic and eco-friendly than ever.
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