Journal of Materials Chemistry A
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2022
·Vol. 10
·期 19
·10750-10758
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IF 14.511
Hanyu Wang,Wenjing Zou,Yukun Ouyang,Xiong Deng,Hu Luo,Juehao Xu,Xingchong Liu,Haimin Li,Xiaoli Gong,Yue Lei,Yafei Ni,Yongshan Peng
Ionic defects in perovskite films decrease both the power conversion efficiency (PCE) and stability of a perovskite solar cell (PSC). Herein, fluorinated D-pentafluoro-phenylalanine (D-PFPAA) zwitterions are introduced into a perovskite to passivate the ionic defects and effectively consolidate the Pb–X framework to suppress ion migration. The results demonstrate that the amino, carboxyl, and fluorine groups in D-PFPAA can support the multifunctional passivation of both positive and negative ionic defects, including uncoordinated Pb2+ ions and halogen (X−) defects in the perovskites, thereby effectively suppressing charge recombination. Consequently, a D-PFPAA-modified device shows a highest PCE of 21.56% with an increased open circuit voltage of 1.15 V. Apart from the consolidated Pb–X framework, resulting from multifunctional passivation, the fluorine groups in D-PFPAA can also form an effective hydrophobic barrier to protect the perovskite film from moisture-related erosion. As a consequence, the D-PFPAA-modified device retains more than 85% of its original PCE after undergoing 500 h of aging at 45% relative humidity under ambient conditions. This work provides a promising strategy for the realization of efficient and stable PSCs via the selection of fluorinated zwitterions to passivate the ionic defects, inhibit ion migration, and protect against moisture damage.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Haichao Liu,Cong Geng,Peng Wei,Huamei Chen,Shenshen Zheng,Haobin Wang,Yahong Xie
Recently, perovskite solar cells (PSCs) have attracted widespread attention due to their outstanding advantages. Hole-transport-material-free carbon-based PSCs (C-PSCs) are some of the most potential devices. However, intrinsically inferior contact at perovskite/carbon interfaces and low conductivity of carbon electrode are restricting the commercial application of C-PSCs. In this study, an N, O co-doped biomass porous composite carbon electrode based on KOH-activated soybean dregs carbon, conductive carbon black and polymethylmethacrylate—N-KSDC—is prepared via a spraying method to efficiently improve perovskite/carbon interface qualities as well as enhance the efficiency and stability of C-PSCs. The results showed that the best power conversion efficiencies of N-KSDC-based C-PSCs with an active area of 0.08 and 1 cm 2 were 13.45% and 11.08%, respectively. In addition, unencapsulated PSCs retained 92% of their initial power conversion efficiencies under ambient conditions without intentionally controlling humidity for 62 days. In this study, we propose a feasible and effective strategy to improve the performance and stability of perovskite/carbon interfaces in C-PSCs.
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ACS Applied Nano Materials
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2022
·
IF 6.14
Lijing Zhang,Jiaqi Han,Yuchao Wang,Wenbo Yang,Shengyang Tao
Achieving a room-temperature Suzuki–Miyaura coupling (SMC) with high efficiency is of great significance to the development of low-carbon organic synthesis. Nevertheless, it is still a great challenge to construct a promising nanocatalyst with high activity for room-temperature SMC reaction. In this paper, a strong alkaline-supported nanocatalyst Pd/Mg(OH)2/MgO–ZrO2 was rationally developed based on MgO–ZrO2 hybrid nanofibers. Physicochemical characterizations present that the in situ conversion of MgO to Mg(OH)2 on the surface of the nanofibers results in a great increase in surface alkalinity of the carrier. The strong alkalinity can greatly accelerate the oxidation addition and transmetalation of the SMC process, resulting in the obvious reduction of activation energy of the reaction (Ea = 9.0 kJmol–1 for Ph–Br). The coupling conversion can reach up to 100% at room temperature within 8 min with a maximum TOF > 6516 h–1. It also shows an excellent performance in substrate applicability and chlorobenzene activation. The rational design of a high-basicity catalyst for room-temperature SMC will be a rewarding attempt for the development of low-carbon green organic synthesis.
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Jie Wen,Zewei Liu,Hongxia Xi,Bichun Huang
In this work, hydrothermal technique combined with KOH activation were employed to develop a series of porous carbons (NPCK- x ) using tobacco stem as a low-cost carbon source and (NH 4 ) 2 C 2 O 4 as a novel nitrogen-doping agent. Physicochemical properties of NPCK- x were characterized by Brunauer-Emmett-Teller, field emission scanning electron microscopy, X-ray diffraction, Raman microscope, elemental analysis, and X-ray photoelectron spectroscopy. Results showed that the NPCK- x samples possessed large surface areas (maximum: 2875 m 2 /g), hierarchical porous structures, and high degree of disorder. N-containing functional groups decomposed during activation process, which could be the dominant reason for appearance of abundant mesopores and well-developed pore structure. Dynamic chlorobenzene adsorption experiments demonstrated that carbon materials with (NH 4 ) 2 C 2 O 4 modification exhibited higher adsorption capacity (maximum: 1053 mg/g) than those without modification (maximum: 723 mg/g). The reusability studies of chlorobenzene indicated that the desorption efficiency of (NH 4 ) 2 C 2 O 4 modified porous carbon reached 90.40% after thermal desorption at 100°C under N 2 atmosphere. Thomas model fitting results exhibited that the existence of mesopores accelerated the diffusion rate of chlorobenzene in porous carbon. Moreover, Grand Canonical Monte Carlo simulation was conducted to verify that micropores with pore sizes of 1.2–2 nm of the optimized porous carbon were the best adsorption sites for chlorobenzene and mesopores with pore sizes of 2–5 nm were also highly active sites for chlorobenzene adsorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lei Zhang,Bingquan Han,Zhiyuan Liu,Yuxin Yao,Lingbo Xu,Peng Wang,Ping Lin,Xiaoping Wu,Xuegong Yu,Can Cui
CsPbI 3 all-inorganic perovskite has now drawn much attention due to its superior thermal stability compared with the organic-inorganic hybrid counterparts. Despite the great progress achieved recently in this field, CsPbI 3 still suffers from low phase stability when exposed to moisture. We found the phase transition of CsPbI 3 would be accelerated after depositing the conventional hole transport material (HTM) 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]− 9,9′-spirobifluorene (spiro-OMeTAD). This is attributed to the negative effects of the additives in spiro-OMeTAD HTM: the hydrolysis of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), the corrosivity of 4-tert-butylpyridine (TBP), and the evaporation of TBP. By slightly modifying the additive content, full coordination between LiTFSI and TBP could be achieved and the negative effects mentioned above could be mitigated. Furthermore, tris(2-(1 H-pyrazol-1-yl)− 4-tert-butylpyridine)cobalt(III)-tris(bis(trifluoromethylsulfonyl)imide) (Co(III)TFSI) was added to promote oxidation of spiro-OMeTAD HTM in inert environment. With these approaches of additive engineering, HTMs with better interface contact and charge transport capability could be obtained. The device with optimized spiro-OMeTAD HTM achieved a champion power conversion efficiency (PCE) of 10.61% compared with 6.63% of the control one. Moreover, the optimal device maintained 81% of its initial PCE after storage for 30 days, exceeding that (68%) of the control one. Our results highlight the importance of spiro-OMeTAD HTM on the stability of CsPbI 3 all-inorganic perovskite and provide a facile and feasible way to increase the stability and performance of corresponding solar cells.
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OPTIK
·
2022
·
IF 2.84
Taotao Zhang,Rui Xu,Hang Lv,Zhenxiang Wang,Haidong Ye,Haiqin Liu,Liang Chen
The light-emitting electrochemical cells (LECs) have received extensive attention from researchers in recent years due to their simple single-layer structure, air-stable metal electrodes, and low manufacturing cost. So far, reports on the use of LEC active layer emitter materials have mainly focused on ionic transition metal complexes (iTMCs) and conjugated polymers (CPs). The application of the above materials in blue LECs is restricted due to high cost, complicated synthesis process, and poor stability, which results in the slow development of blue LECs. A novel blue LECs device based on aggregation-induced emission (AIE) small molecule (2,3-diphenylbenzo[ b ]thiophene S, S-sulfur dioxide, DP-BTO) with a peak luminance of 36.58 cd/m 2 , a CEmax of 1.14 cd/A, and an EQEmax of 0.46% was reported in this work. The blue light emission centered at ~460 nm was exhibited at a voltage above 6 V. This work successfully constructed blue light-emitting LECs devices based on AIE materials, opening up a new research avenue for the application of AIE materials in the field of thin-film device development.
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Frontiers in Materials
·
2022
·
IF 3.985
Long Biyu,Zhou Xianzi,Cao Huafeng,Chen Renjie,He Nannan,Chi Lina,Fan Penghui,Chen Xiaohong
Superior encapsulation technology is important for PSCs to prolong their lifetime and realize their commercial application. Paraffin/EVA/paraffin composite encapsulated layers were fabricated with the ambient environment under the thermal temperature of 80°C, which has advantages for simple procedures and low cost. PSCs encapsulated with paraffin/EVA/paraffin and pure EVA layers maintained 95 and 45% of the initial power conversion efficiency (PCE) aged for 1000 h at RH 75%, respectively. Paraffin/EVA/paraffin-encapsulated PSCs were immersed in water for 5 h, which remained 98% of the original PCE, which is far superior to EVA-encapsulated PSCs. High melting point paraffin at 68°C shows better encapsulation than low melting point (60 and 55°C) paraffin, indicating that the high molecular weight of paraffin helps improve the encapsulation performance of PSCs. PSCs encapsulated with paraffin/EVA/paraffin showed better stability of Voc than pure EVA layer because paraffin can inhibit defects, voids, and edges of metal electrodes that quickly expand, and decay. Therefore, paraffin/EVA/paraffin combination encapsulation is an effective strategy, which can form continuous and dense hydrophobic composite encapsulation films with a friendly metal electrode.
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RSC Advances
·
2022
·Vol. 12
·期 13
·7950-7960
·
IF 4.036
Chuanxiang Zhang,Xiqiang Li,Lingling Ding,Chen Jin,Haijun Tao
Perovskite solar cells (PSCs) are considered to be ideal energy devices, where perovskite-type organic metal halides act as light-absorbing materials. In PSCs, the photoexcitons are extracted and separated to afford high photoelectric conversion efficiency under the action of the built-in electric field (Ebi). However, the current challenge is that a low Ebi cannot provide a sufficient driving force to separate photonic excitons, which causes the captured charges to escape from the deep energy-level defect state. Here, the ferroelectric material barium titanate (BaTiO3) was directly introduced into the perovskite precursor solution to reduce the defection density (to 8.58 × 1017 cm−3) in PSCs and promote the separation of photoexcitons. Furthermore, the addition of BaTiO3 improved the quality of the perovskite film and significantly increased the photoelectric performance after the polarization treatment. This is mainly attributed to the residual polarization electric field generated by ferroelectric polarization, which increased the Ebi of the PSCs and the width of the depletion layer and inhibited the non-radiative recombination of carriers. This work provides a possibility to design and develop optoelectronic devices with high-efficiency optoelectronic response behavior.
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Advanced Optical Materials
·
2022
·Vol. 10
·期 7
·2102320
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IF 10.05
Jiajun Wei,Liting Tao,Liqi Li,Minxing Yan,Chenhao Wang,Wei Sun,Deren Yang,Yanjun Fang
Metal halide perovskites (MHPs) have emerged as promising X-ray detection materials. However, most MHP-based X-ray detectors are incompatible for large-area preparation and integration, and suffer from the serious ion migration issue. This work demonstrates a “perovskite-in-a-host” nanocomposite structure for X-ray detection, by embedding the perovskite nanocrystal (PNC) sensitizers in the organic interpenetrating charge transport channels to work as the X-ray attenuation layer. Intriguingly, the photon sensitization mechanism can be readily tuned from indirect- to direct-type X-ray conversion by decreasing the ligand density on the PNC surface, which significantly increases the sensitivity to 5 696 µC Gy air –1 cm –2 . Besides, the ion migration gets suppressed due to the ion blocking effect of the surrounding organic phase. Therefore, an ultra-small dark current relative drift of 3.57 × 10 –9 cm s –1 V –1 is achieved even under an extremely large electric field up to 5 100 V cm –1 , ensuring a low detection limit down to 72 nGy air s –1 . The superior sensitivity and biasing stability enable the high performance X-ray imaging capability of the devices, which exhibit great potential in scaling up and integration for the flat panel imaging.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Jiuyao Du,Jifeng Yuan,Hui Wang,Fei Huang,Jianjun Tian
Charge carrier recombination caused by the buried interface defects in perovskite solar cells is widely accepted as a challenge that seriously degrades device performance and stability. Herein, we devise a facile method to passivate the buried titanium dioxide (TiO2)/perovskite interface using potassium hydroxide (KOH) through a wet chemical process. OH– and K+ can coordinate with the undercoordinated Ti and O on the TiO2 surface, respectively. Meanwhile, due to the strong interaction between K+ and Br–, Br– in the MAPbI2.85Br0.15 perovskite would be attracted and thus migrate toward the TiO2/perovskite interface during the formation process. Hence, KOH can not only passivate the interface but also effectively glue the TiO2 electron transfer layer and the perovskite layer together to generate a tightly integrated interface, which effectively reduces interface defects. Moreover, KOH at the interface can mediate the nucleation process and promote the formation of the perovskite layer with less defects. Thus, improved charge carrier extraction and reduced nonradiative recombination are achieved. As a result, the perovskite solar cell with KOH interface passivation demonstrates an increase in power conversion efficiency from 17.12 to 19.19%, associated with a good improvement of stability.
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JOURNAL OF MASS SPECTROMETRY
·
2022
·Vol. 57
·期 3
·e4813
·
IF 2.394
Liutian Wu,Keke Qi,Minggao Xu,Chengyuan Liu,Yang Pan
Desorption electrospray ionization/post-photoionization (DESI/PI) is a newly developed ionization method by the combination of DESI and post-photoionization for the simultaneous imaging of polar and nonpolar compounds in biological tissues. Dopants are of great importance in DESI/PI for the enhancement of signal intensities through ion–molecule reactions. In this work, to evaluate the performance of dopants in DESI/PI, an efficient homogenate model was developed, and four kinds of dopants (toluene, chlorobenzene, bromobenzene, and anisole) were tested using homogenate of mouse brain tissue as target sample. The influences of the dopants on the signal enhancements of different compounds were explained reasonably by the ionization mechanism. Then, the dopants with their optimum volume contents were applied to the mass spectrometry imaging (MSI). For a comprehensive imaging of various compounds with different polarities, methanol/toluene/formic acid (7:3:0.1) was chosen as the best choice. Finally, the stronger quantitative ability of DESI/PI with toluene as dopant for a few compounds in mouse brain tissue was demonstrated.
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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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