ACS Applied Nano Materials
·
2024
·
IF 5.3
Ziwei Sun,Yong Wang,Ye Liu,Ruliang Liu,Tao Chen,Shuming Ye,Niu Lai,Haoyang Cui,Feng Lin,Rongfei Wang,Jie Yang,Shaoying Ke,Chong Wang
All-inorganic perovskite materials have gained enormous attention in photodetectors (PDs) due to their high charge carrier mobility, cost-effectiveness, and tunable bandgap. However, instability and corresponding performance degradation of perovskite PDs when exposed to surrounding humidity persist as challenges. In this work, a composite PD was fabricated by combining CsPb2Br5 nanowires and CsPbBr3 thin-film perovskites as an example to address these problems. The CsPb2Br5 nanowires were prepared by a facile water-bath method to improve the water resistance, and the subsequent evaporation of the CsPbBr3 film formed a type-I heterostructure to enhance its photosensitivity of PDs. As a result, the device exhibits a 10 times higher responsivity of 206 mA/W than that of the bare CsPbBr3 thin film device and maintains 92.85% of its original detectivity after being exposed to a humid environment (RH = 75%) for 144 h. Furthermore, the corresponding fundamental characterization was also performed to reveal the role of CsPb2Br5 nanowires in enhancing the overall performance of the PD. This work provides a simple and efficient approach to enhancing the durability and performance of all-inorganic halide perovskite devices through the embedding of CsPb2Br5 perovskite nanowires.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2206838
·
IF 19.924
Jingwei Zhu,Benlin He,Wenyu Zhang,Rui Tui,Haiyan Chen,Yanyan Duan,Hao Huang,Jialong Duan,Qunwei Tang
One of the key problems to improving the performance of a typical perovskite solar cell (PSC) is to minimize the defect-determined nonradiative recombination. So far, the cutting-edge strategies mainly focus on the film-scale defect manipulation at grain boundaries and surfaces by trial-and-error, but the intrinsic passivation mechanism and fundamental guideline in the perspective of crystal lattices are still unclear. Herein, a much lower defect formation energy of Pb Br antisite defect at (110) plane than that at (h00) planes is demonstrated by theoretically studying the crystal plane-dependent defect density in an inorganic CsPbBr 3 film, and then the authors precisely control the plane growth by selectively anchoring (pseudo-) halide anions from ionic liquids to (110) plane. Because of the different adsorption energies on various planes, the growth of defective (110) plane is suppressed, leading to the formation of (h00) plane-oriented film. Finally, the all-inorganic CsPbBr 3 PSC passivated by ionic liquid EMImCl delivers the best efficiency of 10.71% with an open-circuit voltage up to 1.650 V. This work provides an in-depth insight into defect formation and passivation mechanism to stabilize perovskite photovoltaics.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 8
·2000162
·
IF 3.217
Qingxiao Meng,Jianyong Feng,Huiting Huang,Xiaopeng Han,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
Both phase and morphology of perovskite films are very important for high-performance optoelectronic devices. Although a two-step method based on CsBr ethylene glycol monomethylether (EGME) solution can prepare pure-phase CsPbBr 3 films, they have a poor morphology due to excessive Ostwald ripening. Herein, a bi-solvent engineering strategy is demonstrated to simultaneously optimize phase and morphology of CsPbBr 3 films in a two-step solution method, which uses the bi-solvents of EGME and isopropanol (IPA) instead of EGME for CsBr solution at the second step. Optimizing the volume ratio of bi-solvents and immersion time can control the Ostwald ripening effectively and result in pure-phase, compact, and smooth CsPbBr 3 films. Finally, the prepared films are applied to perovskite solar cells (PSCs) with a structure of fluorine-doped tin oxide (FTO)/compact TiO 2 (c-TiO 2 )/CsPbBr 3 /carbon. In comparison with EGME, the champion power conversion efficiency (PCE) of devices from EGME/IPA bi-solvents increases from 3.57% to 7.29% owing mainly to higher coverage, smoother surface, and lower trap density of CsPbBr 3 films from EGME/IPA bi-solvents. This work provides a simple and efficient method for the preparation of high-quality CsPbBr 3 films.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yue Zhao,Shujie Jiao,Shuo Liu,Yimin Jin,Song Yang,Xianghu Wang,Tong Liu,Hongyan Jin,Dongbo Wang,Shiyong Gao,Jinzhong Wang
All-inorganic metal halide perovskite is considered as one of the most promising perovskite materials for photodetectors , because of its remarkable optoelectronic characteristics and stability. Whereas, it remains challenge to achieve both excellent photodetection performance and stability due to the multitudes of defects in perovskite films. Herein, an interface engineering based on surface passivation strategy to achieve high-quality CsPbBr 3 perovskite films by introducing thioacetamide (C 2 H 5 NS, abbreviated as TAA) as interface materials is reported. The interaction between TAA and perovskite passivates the uncoordinated Pb 2+ on the surface of CsPbBr 3 film, suppress carrier non-recombination and accelerates carriers transfer. The self-powered photodetector based on the passivated CsPbBr 3 film prefers the maximum responsivity of 0.26 A W −1 and detectivity of 8.39 × 10 12 Jones under 520 nm irradiation. In addition, the optimized photodetector exhibits excellent stability and maintains more than 98% of its initial photocurrent when operating over 8 h. This work demonstrates an alternative approach for the preparation of improved performance in CsPbBr 3 perovskite photodetectors and associated photoelectric devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chuanqi Liu,Dingyu Yang,Haibo Tian,Wen Zhang,Jun Zhu
The CsPbX 3 perovskites have demonstrated promising applications in the field of X-ray detection. Appropriate element doping to substitute Pb in CsPbX 3 not only improves the photoresponse performance of the resulting material but also reduces the Pb content for achieving environmental protection. Herein, X-ray detectors based on Sr-doped CsPb 1-x Sr x Br 3 thick films were developed. The effects of Sr doping concentration were investigated. The incorporation of Sr increased the density of the CsPbBr 3 thick film and modulated the bandgap of the materials. CsPb 1-x Sr x Br 3 exhibited good optical responses at different bias voltages and X-ray doses. The X-ray response improved as the Sr-doping concentration increased. Therefore, the partial substitution of Sr into CsPbBr 3 is suitable for reducing the Pb content in X-ray detectors. Furthermore, the development of CsPb 1-x Sr x Br 3 thick films provides a new strategy for the detection of X-rays.
研究领域:
材料科学
·
医学成像
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yue Zhao,Shujie Jiao,Shuo Liu,Yimin Jin,Song Yang,Xianghu Wang,Tong Liu,Hongyan Jin,Dongbo Wang,Shiyong Gao,Jinzhong Wang
All-inorganic perovskite photodetectors aroused widespread attention due to the splendid photoelectric characteristics and stability. However, the inherent defects in perovskite films hinders the progress of the photodetectors. Here, a Lewis base of thioacetamide additive was used to passivate defects in CsPbBr 3 perovskite films based on Lewis acid-base interactions. The quality of the film has been distinctly enhanced due to the interaction between the S donor in thioacetamide and the uncoordinated Pb 2+ in perovskite, diminishing the defect state density and inhibits the non-radiative recombination. The self-powered champion device based on CsPbBr 3 film contain optimum thioacetamide additive exhibits a lower dark current density of 4.01 nA/cm 2 , a peak responsivity of 0.39 A/W, a rapid rise/decay time of 12.4 μs/56.2 μs, a peak detectivity of 1.08 × 10 13 Jones and a lager linear dynamic range of 99 dB, which are much better than photodetector based on CsPbBr 3 perovskite without TAA additive. Furthermore, it exhibits high-resolution imaging sensing capability at zero bias. This research affords guidance for the performance improvement and application of all-inorganic perovskite photodetectors.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 43
·1804394
·
IF 13.325
Junpeng Zeng,Xiaoming Li,Ye Wu,Dandan Yang,Zhiguo Sun,Zehao Song,Hao Wang,Haibo Zeng
All-inorganic halide perovskite is considered as outstanding candidate of organic–inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space-confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr 3 polycrystalline films realize low trap density (3.07 × 10 12 cm −3 ) and high carrier mobility (9.27 cm 2 V −1 s −1 ) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W −1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr 3 based PDs. A record detectivity of 7.55 × 10 13 and 3.1 × 10 5 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all-inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Beilei Yuan,Haoming Wei,Jingwei Li,Yu Zhou,Fan Xu,Jinkai Li,Bingqiang Cao
In this paper, inorganic halide perovskite cesium lead bromide (CsPbBr3) films are epitaxially grown on (100)-oriented SrTiO3 substrates by pulsed laser deposition (PLD). This method has the distinctive advantages to grow high-quality films with a precise composition, designed crystalline orientation, and controlled uniform thickness. By optimizing the substrate temperatures and laser pulse numbers, (100)-CsPbBr3 films with uniform morphology are grown on a SrTiO3 substrate via a cubic-on-cubic epitaxial growth mode, which is proven by XRD investigation. Detailed photophysical spectroscopy study including femtosecond transient absorption spectra and detailed low-temperature photoluminescence spectra indicate that such epitaxial CsPbBr3 films are of very low defects in the bandgap. The temperature-dependent resistivity measurement reveals that the epitaxial CsPbBr3 films show a typical thermally activated carrier behavior with a bandgap value of 2.37 eV, which is very consistent with the optical result and indicates a quasi-intrinsic semiconductor nature of such an epitaxial film. Our results confirm that CsPbBr3 films with high crystal quality and lower defect density can be epitaxially grown with PLD for further superlattices and quantum wells.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Frontiers of Optoelectronics
·
2024
·Vol. 17
·期 1
·1-7
·
IF 4.1
Li Zha,Li Wancai,Li Dehui,Tang Wei,Liang Huageng,Song Huaibing,Chen Chao,Gao Liang,Tang Jiang
Chiral inorganic semiconductors with high dissymmetric factor are highly desirable, but it is generally difficult to induce chiral structure in inorganic semiconductors because of their structure rigidity and symmetry. In this study, we introduced chiral ZnO film as hard template to transfer chirality to CsPbBr 3 film and PbS quantum dots (QDs) for circularly polarized light (CPL) emission and detection, respectively. The prepared CsPbBr 3 /ZnO thin film exhibited CPL emission at 520 nm and the PbS QDs/ZnO film realized CPL detection at 780 nm, featuring high dissymmetric factor up to around 0.4. The electron transition based mechanism is responsible for chirality transfer. Graphical Abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 16
·2938-2944
·
IF 3.545
Lijia Guo,Manying Liu,Yan Lei,Liwei Mi,Zhi Zheng
Inorganic perovskite CsPbBr3 is a suitable candidate owing to its excellent stability and outstanding visible light absorption. However, it is a huge challenge to fabricate single phase CsPbBr3 films. Herein, we developed an in situ metal reaction strategy to fabricate single phase CsPbBr3 films by reacting Pb precursors with CsBr/HBr in methanol solution. The thickness of the sputtered Pb film plays a key role in inhibiting the formation of a secondary CsPb2Br5 phase. The results indicate that the single phase CsPbBr3 films can be obtained by using below 40 nm of the sputtered Pb films, and the single phase CsPbBr3 device architecture exhibits 4.08% power conversion efficiency. This device can retain over 95% of the initial efficiency after 30 days of storage without packaging in an ambient environment.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Xiaojing Wan,Ze Yu,Wenming Tian,Fuzhi Huang,Shengye Jin,Xichuan Yang,Yi-Bing Cheng,Anders Hagfeldt,Licheng Sun
All-inorganic cesium lead bromide (CsPbBr 3 ) perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb stability. However, the fabrication of high-quality CsPbBr 3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common solvents. Herein, we report a facile solution-processed approach to prepare high-quality CsPbBr 3 perovskite films via a two-step spin-coating method, in which the CsBr methanol/H 2 O mixed solvent solution is spin-coated onto the lead bromide films, followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film morphology. In this fashion, dense and uniform CsPbBr 3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect density. The effectiveness of the resulting CsPbBr 3 films is further examined in perovskite solar cells (PSCs) with a simplified planar architecture of fluorine‒doped tin oxide/compact TiO 2 /CsPbBr 3 /carbon, which deliver a maximum power conversion efficiency of 8.11% together with excellent thermal and humidity stability. The present work offers a simple and effective strategy in fabrication of high-quality CsPbBr 3 films for efficient and stable PSCs as well as other optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyue Liu,Xianhua Tan,Zhiyong Liu,Bo Sun,Junjie Li,Shuang Xi,Tielin Shi,Guanglan Liao
All-inorganic CsPbBr 3 perovskite has triggered great interests in photovoltaic field owing to its superior stability. However, the uncontrollable CsPbBr 3 film growth in solution always leads to a poor film quality with low phase-purity as well as many surface and bulk defects. Herein, we demonstrate an environmentally friendly non-solution route to fabricate high-quality CsPbBr 3 films for carbon-based planar perovskite solar cells . By precisely tuning the thickness ratio of the evaporated CsBr to PbBr 2 precursors ( r ), the dominant phase conversion of the cesium lead bromide perovskites from PbBr 2 -rich CsPb 2 Br 5 ( r ≤ 12:7) to CsPbBr 3 ( r = 12:8), and further to CsBr-rich Cs 4 PbBr 6 ( r ≥ 12:9) are achieved. The optimized CsPbBr 3 perovskites are highly phase-pure and crystallized with ultra-high light absorption ability. The as-prepared CsPbBr 3 films also exhibit a dense and uniform morphology with large grain sizes and monolayer-vertical aligned grains. The corresponding devices deliver a champion PCE of 7.58%, which is an excellent efficiency among carbon-based CsPbBr 3 cells with evaporated CsPbBr 3 light absorbers. The large-area (1 cm 2 ) devices also achieve an efficiency of 6.21%. Moreover, the unencapsulated CsPbBr 3 devices present superior moisture and thermal stabilities. Our work provides a facile approach to fabricate high-quality and large-area CsPbBr 3 films for highly efficient solar cells, light-emitting diodes and photodetectors .
研究领域:
材料科学
·
能源科学
·
光伏技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）