ACS Applied Materials & Interfaces
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2022
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IF 10.383
Chenhui Duan,Zihui Liang,Jinguo Cao,Bowen Jin,Yidong Ming,Shimin Wang,Binghe Ma,Tao Ye,Congcong Wu
Formamidinium (FA)-based perovskites remained state-of-the-art in the field of perovskite solar cells (PSCs) owing to the exceptional absorption and carrier transport properties, while the transition from photoactive (α-) to photoinactive (δ-FAPbI3) phase is the impediment that causes performance degradation and thus limits the deployment of FA-based PSCs. The unfavorable phase transition originates from tensile strain in the FAPbI3 crystal lattice, which undergoes structural reorganization for lattice strain balancing. In this work, we found that the ionic liquid (IL) could be used as the strain coordinator to balance the lattice strain for stability improvement of FAPbI3 perovskite. We theoretically studied the electronic coupling between IL and FAPbI3 and unraveled the originality of the IL-induced compressive strain. The strain-relaxed α-FAPbI3 by IL showed robust stability against environmental factors, which can withstand ambient aging for 40 days without any phase transition or decomposition. Moreover, the strain-relaxed perovskite films showed a lower trap density and resulted in conversion efficiency improvement from 18.27 to 19.88%. Based on this novel strain engineering strategy, the unencapsulated PSCs maintained 90% of their initial efficiency under ambient-air aging for 50 days.
研究领域:
材料科学
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能源技术
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光伏器件
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shu Hu,Chenhong Xiang,Pingyuan Yan,Yang Zhang,Heng Li,ChuanXiang Sheng
Formamidinium (FA)-based quasi-two dimensional (Q-2D) perovskite normally has better environmental stability than methylammonium (MA)-based one, however, it is difficult to form larger n ( n > 2) phases of layered FA-based perovskite due to their larger formation energies, resulting in insufficient absorption of sunlight and then poor performance of its solar cell. Here we partially replace FA with MA to form (BA) 2 (FA 1- x MA x ) 3 Pb 4 I 13 mixture, which contains enriched larger n ( n = 3, 4, a n d larger) phases, where BA is butylammonium. Particularly, the (BA) 2 (FA 0.8 MA 0.2 ) 3 Pb 4 I 13 perovskite film show the best stability under ambient conditions. Furthermore, using inverted planar heterojunction structure, the photovoltaic device based on (BA) 2 (FA 0.8 MA 0.2 ) 3 Pb 4 I 13 demonstrates power conversion efficiency of 14.2 %, which is among the highest efficiencies for the FA-rich Q-2D perovskites with n ≤ 4. This work highlights that FA-rich Q-2D perovskites have great promise for optoelectronic devices .
研究领域:
材料科学
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光伏技术
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能源研究
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DOI
高影响因子
Small
·
2022
·Vol. 18
·期 46
·2204742
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IF 15.153
Zihui Liang,Bowen Jin,Jinguo Cao,Fengxiang Chen,Jing Li,Shimin Wang,Kai Wang,Congcong Wu
Surface states are one of the crucial factors determining the phase stability of formamidinium-based perovskites. Compared with other compositions, exclusive lattice strain in FAPbI 3 perovskite generates defects at the surface more readily, making them more vulnerable at the surface and easier to trigger the phase transition from α-phase to the non-perovskite δ-phase. In order to regulate the surface quality, here, a chemi-mechanical cleavage approach is reported, i.e., tape peel-zone (PZ), implemented by attaching and peeling off the ordinary Kapton Tapes. The PZ approach can simultaneously eliminate the surface defects of perovskite and siliconize the film surface with hydrophobic silicone compounds. These two functionalities endow α-FAPbI 3 perovskite with a robust hydrophobic surface, which can sustain for 30 days under a relative humidity of 60% and withstand the high temperature up to 240 °C. The unencapsulated PZ-treated cells show 80.3% of initial performance after 90 h of continuous operation in ambient air, which is 31.4 times more stable than the pristine cell.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2023
·Vol. 29
·期 37
·e202300576
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IF 4.3
Wenlong Song,Xin Wang,Tian Hou,Xiaoshan Li,Hongwang Chen,Yue Yu,Xiaoran Sun,Ambrish Singh,Meng Zhang
Graphical Formate addtives play a critical role in regulating the crystal growth and orientation of MA-free perovskite films prepared with gas-quenching. The MA-free device with addition of FAFO demonstrate a champion power conversion efficiency of 20.94 % and improved stability without any interfacial passivation. In order to promote the commercialization of perovskite solar cells, gas-quenching is considered to be a promising technique for perovskite film fabrication. However, when handling with methylammonium-free (MA-free) perovskites, it is often difficult to obtain high-quality perovskite films by gas-quenching. Herein, formate additives are employed to regulate the crystallization of MA-free perovskite, and improve the quality of perovskite films. Different additives of formamidine formate (FAFO) and potassium formate (KFO) is compared to investigate the role of formate groups in the crystallization of perovskite films prepared by gas-quenching. The FAFO additive facilitates the perovskite crystallization in (001) orientation whereas KFO favors for (111) orientation. The MA-free device with addition of FAFO demonstrate a champion power conversion efficiency of 20.94 %, compared to that of 20.14 % for KFO devices. In addition, FAFO device also exhibits improved thermal stability in ambient condition without encapsulation, extending the T 80 lifetime by 18 times compared to the pristine device.
研究领域:
材料科学
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能源技术
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光伏器件
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产品关联
DOI
PubMed
高影响因子
Materials Horizons
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2022
·Vol. 10
·期 1
·122-135
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IF 15.717
Xueyun Wu,Yiting Zheng,Jianghu Liang,Zhanfei Zhang,Congcong Tian,Zhiang Zhang,Yixuan Hu,Anxin Sun,Chenyang Wang,Jianli Wang,Ying Huang,Zhifu Zhang,Kolan Madhav Reddy,Chun-Chao Chen
Green-solvent-processed perovskite solar cells (PSCs) have reached an efficiency of 20%, showing great promise in safe industrial production. However, the nucleation process in green-solvent-based deposition is rarely optimized, resulting in randomized crystallization and much lowered reported efficiencies. Herein, a nanostructured tin oxide nanorods (SnO2-NRs) substrate is utilized to prepare a high-quality formamidinium (FA)-based perovskite film processed from a green solvent of triethyl phosphate (TEP) with a low toxic antisolvent of dibutyl ether (DEE). Compared with SnO2 nanoparticles, the oriented SnO2-NRs can accelerate the formation of heterogeneous nucleation sites and retard the crystal growth process of the perovskite film, resulting in a high-quality perovskite film with uniform grain growth. Furthermore, a chlorine-terminated bifunctional supramolecule (Cl-BSM) is introduced to passivate the increasing interfacial defects due to the vast contact area in SnO2-NRs. Correspondingly, the substrate design of SnO2-NRs with Cl-BSM increases the power conversion efficiency (PCE) of green-solvent-processed PSCs to 22.42% with an open-circuit voltage improvement from 1.02 to 1.12 V, which can be attributed to the uniform grain growth and reduced carrier recombination at the SnO2-NRs/perovskite interface. More importantly, the photo and humidity stabilities of the unencapsulated device for up to 500 and 1000 hours are also achieved with negligible interfacial delamination after aging. This work provides a new perspective on the future industrial scale production of PSCs using environment-friendly solvents with compatible substrate design.
研究领域:
材料科学
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太阳能技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xiaoran Sun,Xin Yang,Xin Wang,Tian Hou,Hongwang Chen,Jianbo Liu,Zhipeng Fu,Wenjing Yu,Wenfeng Zhang,Zhu Ma,Yuelong Huang,Xu Liu,Meng Zhang
Gas-quenching fabrication of perovskite films demonstrates promising compatibility for commercialization of perovskite photovoltaics . Seeking suitable ligand for the perovskite precursor inks to improve the crystalline quality of gas-quenched methylammonium free perovskite films is critical for realizing up-scalable fabrication of stable perovskite solar cells . In this work, a series of pyrrolidone-based ligands are employed in gas-quenching fabrication of FA 0.9 Cs 0.1 PbI 3 perovskite films. Optical and morphological characterizations indicate 2-pyrrolidone is the most preferred ligand to deliver a neat buried-interface as well as a light-trapping surface at the rear of the device, which maximized the light-harvesting and the photocurrent of the device. The corresponding device achieved a power conversion efficiency of 21.6% without any interfacial passivation, as well as reduced defect density from their electrical characteristics . Moreover, a more stable performance of the device is obtained with 2-pyrrolidone compared to other pyrrolidone-based ligands, demonstrating 2-pyrrolidone as a promising ligand in designing the perovskite inks for methylammonium-free perovskite solar cells .
研究领域:
材料科学
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光伏技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2022
·Vol. 32
·期 48
·2208694
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IF 19.924
Tao Wang,Daming Zheng,Jike Zhang,Jie Qiao,Changjun Min,Xiaocong Yuan,Michael Somekh,Fu Feng
Photodetectors play an important role in optical communication systems and are essential to achieve high-fidelity signal transmission. The emerging formamidinium-based quasi-2D layered perovskites have attracted attention in the field due to their excellent photoelectric performance and moisture stability. By optimizing film quality and device engineering a high-performance flexible photodetector based on formamidinium-based perovskites ((BA) 2 FAPb 2 I 7 ) is developed, which shows fast response and excellent air-stability. By introducing the formamidinium chloride as an additive the quality and the crystallinity of the film are improved. In addition, localized surface plasmonic resonances (LSPRs) are introduced by embedding Au nanostructures on the substrate, the LSPRs, in turn, enhance light and matter interaction, which further increases the performance of the device. The optimized devices show an ultimate response speed ≈9 µs as well as outstanding long-term environmental stability (environmental conditions > 1000 h). Achieving such high dynamic range and stability is to the best of authors knowledge rarely reported. The device shows the highest responsivity of 2.3 A W −1 , detectivity of 3.2 × 10 12 Jones, and outstanding flexibility stability. Finally, the prepared photodetector is successfully integrated into an optical communication system and tested. The results suggest that formamidinium-based quasi-2D perovskite photodetectors have great potential in optical communication applications.
研究领域:
材料科学
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光学工程
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通信技术
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DOI
高影响因子
Nano Energy
·
2023
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IF 17.6
Tao Wang,Daming Zheng,Karol Vegso,Nada Mrkyvkova,Peter Siffalovic,Xiaocong Yuan,Michael G. Somekh,Laurent Coolen,Thierry Pauporte,Feng Fu
Metal halide perovskites are attracting increasing attention as photodetectors (PDs) materials due to their excellent photoelectric properties. However, integrating perovskite to realize high-resolution perovskite pixel arrays remains critical to enable practical devices. Herein, we demonstrate a high-responsivity and stable 10 × 10 flexible PDs array based on formamidinium-based quasi-2D Ruddlesden-Popper (BA) 2 FAPb 2 I 7 (n = 2) (BA= butylammonium, C 4 H 9 NH 3 + ) perovskite elements for image sensing. The high-performance (BA) 2 FAPb 2 I 7 arrays are synthesized on a polyethylene terephthalate (PET) flexible substrate , on a large scale, high quality, and controllable manner by introducing Au nanoparticles to enhance film quality upon the annealing process and recrystallization by applying formamidinium chloride (FACl) post-treatment to reduce perovskite film defects, combined with an innovative SiO 2 -assisted hydrophilic and hydrophobic surface treatment strategy. The prepared flexible PDs arrays show excellent optoelectronic properties with high responsivity (5.9 A W −1 ), a detectivity of 8.2 × 10 12 Jones, large on/off current ratio (up to 3 × 10 4 ), ultimate response speed (12.8 μs/10.1 μs), and wide spectral response range. In addition, the device shows outstanding mechanical stability under severe bending (θ = 120°) and excellent folding durability after thousands of bending cycles. It also exhibits excellent environmental stability with only a slight degradation of photoresponse after 100 days of storage under the ambient environment. Finally, the integrated flexible PDs arrays can be used as an effective visible light image sensor with good spatial resolution, paving a multifunctional and competitive way for future wearable sensors and artificial vision systems. One-sentence summary Low-dimensional halide perovskite layers pixelized on a polyethylene terephthalate (PET) flexible substrate provide high performance photodetectors.
研究领域:
材料科学
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光电子学
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纳米技术
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成像技术
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可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）