SOLAR ENERGY
·
2021
·
IF 5.742
Honggang Xie,Jiannan Xu,Can Gao,Jiejing Zhang,Chunxiao Gao,Xizhe Liu
CsPbI 3 triggers strong interest in the photovoltaic community for their promising photoelectric property and nonvolatility. However, CsPbI 3 layers with a-phase crystal structure are difficult for preparation, and these layers easily degrade to non-photoactive δ-phase at room temperature. Tuning the composition of precursor solutions is an important method for improving the properties of CsPbI 3 layers. Herein, we prepare inorganic a-CsPbI 3 perovskite solar cells using lead acetate as the lead source, which is different from conventional precursors with lead iodide as the lead source. The lead acetate precursor needs neither incorporating hydrogen iodide nor preparing PbI 2 complex, and it is shown to enlarge the grain size, improve the crystallinity and reduce the trap density of CsPbI 3 layers. By cooperating the lead acetate precursor with EDAI 2 additive, the power conversion efficiency (PCE) of devices increases from 9.2% to 12.9% and the photo-stability of these devices is improved simultaneously.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2023
·Vol. 16
·期 3
·1102-1114
·
IF 6.7
Song He,Xingyu Yu,Juanjuan Wang,WenKang Zhong,Baochang Cheng,Jie Zhao
Emerging resistive switching devices hold the potential to realize densely packed passive nanocrossbar arrays, suitable for deployment as random access memory devices (ReRAMs) in both embedded and high-capacity storage applications. In this study, we have engineered ReRAMs comprising ITO/(UVO-treated) amorphous ZnO (a-ZnO)/MAPbI3/Ag which effectively mitigate cross-talk currents without additional components. Significantly, we successfully executed a comprehensive set of 12 distinct 2-input sequential logic functions in a single halide perovskite ReRAM unit for the first time. Furthermore, these logic functions are devoid of any dependency on external light sources, entail merely 1 or 2 logic steps, and showcase symmetrical operability. A superior resistive switching behavior was achieved by harmonizing the charge transport within the bulk MAPbI3 and the tunneling barriers at the interfaces. The outcomes indicate progress in mitigating cross-talk and executing multiple logic functions within a single halide perovskite ReRAM unit, offering a new perspective for the advancement of halide perovskite ReRAMs.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2015
·Vol. 107
·期 6
·
IF 3.302
Liu Lijia,McLeod John A.,Wang Rongbin,Shen Pengfei,Duhm Steffen
The formation mechanism of perovskite methylammonium lead triiodide (CH 3 NH 3 PbI 3 ) was studied with in situ X-ray photoelectron spectroscopy (XPS) on successive depositions of thermally evaporated methylammonium iodide (CH 3 NH 3 I) on a lead iodide (PbI 2 ) film. This deposition method mimics the “two-step” synthesis method commonly used in device fabrication. We find that several competing processes occur during the formation of perovskite CH 3 NH 3 PbI 3 . Our most important finding is that during vapour deposition of CH 3 NH 3 I onto PbI 2 , at least two carbon species are present in the resulting material, while only one nitrogen species is present. This suggests that CH 3 NH 3 I can dissociate during the transition to a perovskite phase, and some of the resulting molecules can be incorporated into the perovskite. The effect of partial CH 3 NH 3 substitution with CH 3 was evaluated, and electronic structure calculations show that CH 3 defects would impact the photovoltaic performance in perovskite solar cells. The possibility that not all A sites in the A PbI 3 perovskite are occupied by CH 3 NH 3 is therefore an important consideration when evaluating the performance of organometallic trihalide solar cells synthesized using typical approaches.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2023
·
IF 18.9
Mingxuan Lv,Ning Li,Gan Jin,Xiaoyan Du,Xutang Tao,Zhaolai Chen
Long carrier diffusion length is important for optoelectronic devices that require large electrode spacing or thick active layers. Formamidinium lead triiodide (FAPbI 3 ) perovskite is a promising candidate with ultra-long carrier diffusion length, but the existence of internal tensile strain and formation of ion vacancies make its photoactive black phase thermodynamically unstable. Herein, phase-stable FAPbI 3 -based single crystals with negligible absorption loss are achieved by synergy of iodide immobilization and compressive strain. Incorporation of guanidinium (GA + ) cations strengthens the interaction with the inorganic framework and suppresses the formation of iodide ion vacancies. Besides, the interface compressive strain introduced from the indium tin oxide (ITO) substrate counteracts the lattice tensile strain. The as-grown GA 0.015 FA 0.985 PbI 3 single crystals exhibit no phase transition after storage in air for 2,000 h. Moreover, the GA 0.015 FA 0.985 PbI 3 single crystals exhibit ultra-long electron carrier diffusion length of about 600 μm, which is a record value for perovskite materials and only half of silicon single crystals.
研究领域:
材料科学
·
光电材料
·
晶体工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 83
·79952-79957
·
IF 3.289
Yongchao Zhang,Junyi Wang,Jintong Xu,Weiye Chen,Dangqiang Zhu,Wei Zheng,Xichang Bao
Formamidinium lead iodide (FAPbI3) is a more promising broader absorption material than methylammonium lead iodide (MAPbI3) for perovskite solar cells (PSCs). However, in most cases the power conversion efficiencies (PCE) of FAPbI3 based inverted planar PSCs are still lower than those of MAPbI3 ones due to the inferior morphology of FAPbI3 film. In this paper, we demonstrate an optimised formamidinium iodide/isopropyl alcohol (FAI/IPA) modification procedure to improve the photoactive layer for efficient inverted planar FAPbI3 PSCs. The results show that there is an obvious improvement in open circuit voltage, short current density (JSC), and fill factor (FF). Finally, the best PCE of 14.00% with a JSC of 21.75 mA cm−2 and a FF of 0.78 was achieved in low-temperature solution-processed PSCs, which represents a more than 40% enhancement in PCE over that of the PSCs without surface modification. Moreover, the devices exhibit good reproducibility and excellent stability. The simple FAI/IPA modification on the photoactive layer can greatly improve planar FAPbI3 based device performance, which can be a good choice for practical applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2025
·
IF 26
Jiyao Wei,Daoyong Zhang,Ruilin Li,Haimeng Xin,Degong Ding,Xiaohua Xu,Su Zhou,Pengjie Hang,Deren Yang,Xuegong Yu
Phase segregation in wide-bandgap mixed-halide perovskites remains a critical bottleneck for the operational stability of solar cells, including tandem architectures. While lead iodide (PbI 2 ) segregation at grain boundaries during crystallization is now recognized as a key driver of this degradation, strategies to suppress its formation at the source remain underexplored. Here, this challenge is addressed by modulating perovskite crystallization through in situ crosslinking additive engineering. The formation of crosslinked polymer networks immobilized Pb-related frameworks to promote a more complete perovskite phase transformation with PbI 2 suppression. These networks are uniformly distributed throughout the perovskite grain boundaries, concurrently passivate defects and inhibit ion migration, thereby phase segregation in perovskites. This approach enables 1.68-eV perovskite solar cells to achieve a power conversion efficiency of 23.03% with enhanced operational stability, retaining more than 90% of initial performance after 1100 h under maximum power point tracking. Integrated perovskite/silicon tandem cells deliver a certified efficiency of 32.57% (certified 32.41%) in 1-cm 2 area with 90% retention after 1400 h of illumination testing at an elevated temperature of 45 °C.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Lin Zhu,Hao Ma,He Wang,Peng Li,Lin Guo,Bing Zhao
Surface-enhanced Raman scattering (SERS) on organic–inorganic hybrid perovskites have been proved a promising SERS-active substrate. As its inorganic skeleton, lead iodide (PbI 2 ) also represents a novel semiconductor substrate material that serves as either a complement or an alternative to conventional metal-based SERS. Here, for the first time, enhanced Raman scattering (ERS) of 1,2-bis(4-pyridyl)ethylene (BPE) adsorbed on PbI 2 film is observed. To our surprise, we obtained the same ERS spectra on the PbI 2 as SERS spectra obtained on the perovskites, which demonstrates the enhancement of substrate comes from inorganic skeleton rather than organic–inorganic hybrid perovskites. Compared with the normal Raman spectrum of BPE molecules, we find the B u mode of the BPE molecule was selectively enhanced. We demonstrate that it involves a charge transfer (CT) resonance mechanism and takes place between the HOMO of BPE and the conduction band edge of PbI 2 . Moreover, the PbI 2 substrate performs good reproducibility, uniformity and good Raman enhancement (EF ≥ 10 5 ). It is believed that this unusual discovery not only enables PbI 2 to be an enhanced substrate, which also provides a new advance toward a better understanding of SERS chemical mechanism.
研究领域:
材料科学
·
光学
·
化学
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ruixuan Jiang,Yuchen Luan,Jing Li,Feng Ye,Shujie Zhang,Zhiwei Su,Chengkai Jin,Guoqing Tong,Jinhui Tong,Fuzhi Huang,Yi-Bing Cheng,Tongle Bu
Low cost is the eternal theme for any commercial production. Numerous efforts have been explored to realize low-cost, high-efficiency perovskite solar cells (PSCs), such as replacing the traditional spin-coating method with an economical printing strategy, simplifying the device structure, reducing the number of functional layers, etc. However, there are few reports on the use of low-cost precursors. Herein, we enable the low-cost fabrication of efficient PSCs based on a very cheaper low-purity PbI2 via powder engineering. The low-purity PbI2 is blended with formamidinium iodide followed by dissolving in a 2-methoxyethanol solvent, and then, the high-quality FAPbI3 powders are formed via an inverse temperature crystallization process and solvent washing after several simple processes to reduce the impurities. As a result, the devices fabricated using the as-synthesized black powders based on the low-purity PbI2 exhibit a champion power conversion efficiency (PCE) of 23.9% and retained ∼95% of the initial PCE after ∼400 h of storage in the conditions of 25 ± 5 °C and 25 ± 5 RH% without encapsulation. In addition, the upscaling fabrication of a 5 cm × 5 cm solar minimodule also demonstrates an impressive efficiency of 19.5%. Our findings demonstrate an economic strategy for the commercialization of PSCs from the perspective of low-cost production.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NATURE
·
2024
·Vol. 631
·期 8019
·73-79
·
IF 50.5
Kong Lingmei,Sun Yuqi,Zhao Bin,Ji Kangyu,Feng Jie,Dong Jianchao,Wang Yuanzhi,Liu Zirui,Maqbool Shabnum,Li Yunguo,Yang Yingguo,Dai Linjie,Lee Wanhee,Cho Changsoon,Stranks Samuel D.,Friend Richard H.,Wang Ning,Greenham Neil C.,Yang Xuyong
Light-emitting diodes (LEDs) based on metal halide perovskites (PeLEDs) with high colour quality and facile solution processing are promising candidates for full-colour and high-definition displays 1 , 2 , 3 , 4 . Despite the great success achieved in green PeLEDs with lead bromide perovskites 5 , it is still challenging to realize pure-red (620–650 nm) LEDs using iodine-based counterparts, as they are constrained by the low intrinsic bandgap 6 . Here we report efficient and colour-stable PeLEDs across the entire pure-red region, with a peak external quantum efficiency reaching 28.7% at 638 nm, enabled by incorporating a double-end anchored ligand molecule into pure-iodine perovskites. We demonstrate that a key function of the organic intercalating cation is to stabilize the lead iodine octahedron through coordination with exposed lead ions and enhanced hydrogen bonding with iodine. The molecule synergistically facilitates spectral modulation, promotes charge transfer between perovskite quantum wells and reduces iodine migration under electrical bias. We realize continuously tunable emission wavelengths for iodine-based perovskite films with suppressed energy loss due to the decrease in bond energy of lead iodine in ionic perovskites as the bandgap increases. Importantly, the resultant devices show outstanding spectral stability and a half-lifetime of more than 7,600 min at an initial luminance of 100 cd m −2 .
研究领域:
材料科学
·
光电技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
National Science Review
·
2022
·Vol. 9
·期 10
·
IF 23.178
Chen Haoran,Wang Yong,Fan Yingping,Chen Yuetian,Miao Yanfeng,Qin Zhixiao,Wang Xingtao,Liu Xiaomin,Zhu Kaicheng,Gao Feng,Zhao Yixin
Although pure formamidinium iodide perovskite (FAPbI3) possesses an optimal gap for photovoltaics, their poor phase stability limits the long-term operational stability of the devices. A promising approach to enhance their phase stability is to incorporate cesium into FAPbI3. However, state-of-the-art formamidinium–cesium (FA–Cs) iodide perovskites demonstrate much worse efficiency compared with FAPbI3, limited by the different crystallization dynamics of formamidinium and cesium, which result in poor composition homogeneity and high trap densities. We develop a novel strategy of crystallization decoupling processes of formamidinium and cesium via a sequential cesium incorporation approach. As such, we obtain highly reproducible, highly efficient and stable solar cells based on FA1–xCsxPbI3 (x = 0.05–0.16) films with uniform composition distribution in the nanoscale and low defect densities. We also revealed a new stabilization mechanism for Cs doping to stabilize FAPbI3, i.e. the incorporation of Cs into FAPbI3 significantly reduces the electron–phonon coupling strength to suppress ionic migration, thereby improving the stability of FA–Cs-based devices.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yaxin Deng,Shuxian Li,Xuandong Li,Rui Wang,Xin Li
Planar structures for halide perovskite solar cells with the high efficiencies typically use high-temperature processed TiO 2 as the electron transporting layers (ETLs). Here, we demonstrate that an in-situ passivation strategy for TiO 2 film through the introduction of HI during low-temperature preparation process. HI not only controls hydrolysis of TiO 2 precursor but also eliminates defects and suppresses trap states in TiO 2 film. Meanwhile, the double-layer architecture is constructed by coating TiO 2 with SnO 2 layer, the double ETLs can improve the photovoltaic performance of methylamine lead iodide (MAPbI 3 ) perovskite solar cells. The TiO 2 (HI)/SnO 2 ETL can effectively reduce the interfacial charge recombination and facilitate electron transfer. More importantly, the preparation of TiO 2 and SnO 2 are totally performed at low-temperature (150 °C) and the devices are fabricated in uncontrolled ambient conditions. Our best-performing planar perovskite cell using such a TiO 2 (HI)/SnO 2 ETL has achieved a maximum power conversion efficiency (PCE) of 16.74%, and the devices exhibit good stability which maintaining 85% and 83% of their initial efficiency after heating at 100 °C for 22 h and under illuminating upon 1 sun irradiation for 6 h, respectively. Our results suggest a new approach for further improving the stability of PSCs fabricated in the air condition.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2022
·Vol. 14
·期 1
·136-142
·
IF 9.969
Xiang-Yu Zhang,Zi-Qi Zhou,Wen-Xiu Bao,Hong-Xin Tang,Rui-Biao Fu,Zu-Ju Ma,Xin-Tao Wu
Nonlinear optical (NLO) crystals featuring a strong second-harmonic generation (SHG) response and suitable birefringence to achieve phase-matching are in urgent demand in industrial and commercial applications. Based on the substitution strategy, two new NLO lead-iodide formates, K2[PbI2(HCOO)2] and Rb2[PbI2(HCOO)2], have been successfully synthesized using a moderate mixed-solvothermal method. K2[PbI2(HCOO)2] and Rb2[PbI2(HCOO)2] exhibit strong phase-matching SHG responses of 8 and 6.8 × KDP, respectively, a suitable birefringence and transparent window covering most of the visible light and mid-IR region. Crystal structures and theoretical calculations unveil that the origins of the strong SHG response and suitable birefringence can be credibly attributed to the oriented arrangement of the highly distorted [PbI2O4] hexa-coordinated polyhedra, which are consistent in their local dipole moments, as well. This research provides a new strategy to explore high-performance NLO crystals.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）