Advanced Photonics Research
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2021
·Vol. 3
·期 1
·2100198
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IF 0
Lu Cao,Jie Wang,Jia-Rui Rao,Guang-Zhe Ma,Min Gao,Dong Shi
Metal halide perovskites (MHPs) are attracting ever-growing interest across diverse optoelectronic subdisciplines. Yet, the physical mechanism underlying photoexcitation and subsequent photocarrier dynamics remains poorly understood, due to the apparent spectroscopic diversities observed for any certain MHP. Here, diverse spectroscopic characteristics, including static spectral line-shapes and time-resolved photoluminescence (TRPL) traces shown by polycrystalline versus single-crystalline CH 3 NH 3 PbBr 3 perovskites, are restudied. Key photophysical merits, including exciton binding energy ( E B ), Sommerfeld factor ( ξ ), and Urbach energy ( E U ) that account for the diversities, are discussed within the established framework of semiconductor optics. The value of ξ , which increases with E B , determines how much the interband absorption is enhanced beyond that expected for free carriers. The intrinsic band-edge luminescence is identified, with its asymmetric spectral line-shape linked to E U via the van Roosbroeck–Shockley relation. Excited phase evolution, accompanied by rapid electron–hole (e–h) pairs dissociation and subsequent occurrence of e–h plasma, is indicated by the two-stage TRPL traces that are only observable for high-quality single crystals. With all the spectroscopic analysis and interpretations rooted in the established semiconductor optical theorems, the mechanistic merits revealed in this study are informative for plausible identification between the interband and excitonic photophysical processes of MHPs.
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CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Huihuang Huang,Li Jiang,Jiali Peng,Yiming Qi,Songxue Bai,Qianqian Lin
Organic optoelectronics has progressed excitingly in recent years, mainly due to the innovation of donor and acceptor systems. Organic photodetectors based on novel semiconductor materials and well-designed device architectures have also been reported with improved device performance. However, most of them were photodiodes, and it is challenging to integrate them into the well-established readout circuits. Organic phototransistors are mainly based on the hybrid strategy, composed of either hybrid films or multilayer device structures, which complicates charge transfer and charge transport. Most of the organic devices also suffer from poor stability. In this work, we introduce a recently developed p-type copolymer, D18, to fabricate high-performance phototransistors. D18 possesses excellent charge generation, high mobility, and unipolar charge transport, which fulfill the generic design rule of organic phototransistors. The optimized phototransistors based on D18 exhibited extremely low dark current (∼10 pA) and noise (∼10 fA/Hz1/2), a high detectivity of 4 × 1013 Jones, a swift response of <5 ms, and excellent device stability. We also demonstrated flexible phototransistors with decent performance metrics, indicating great potential for next-generation solution-processed photodetectors and flexible electronic devices.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiahui Liu,Zihong Shen,Yuliang Ye,Zunxian Yang,Zhipeng Gong,Bingqing Ye,Yinglin Qiu,Qiaocan Huang,Lei Xu,Yuanqing Zhou,Wenbo Wu,Fushan Li,Tailiang Guo
Sensory adaptation is an essential function for humans to live on the earth. Herein, a hybrid synaptic phototransistor based on the mixed-halide perovskite/organic semiconductor film is reported. This hybrid phototransistor achieves photosensitive performance including a high photoresponsivity over 4 × 103 A/W and an excellent specific detectivity of 2.8 × 1016 Jones. Due to the photoinduced halide-ion segregation of the mixed-halide perovskites and their slow recovery properties, the experience-history-dependent sensory adaptation behavior can be mimicked. Moreover, the light pulse width, intensity, light wavelength, and gate bias can be used to regulate the adaptation processes to improve its adaptability and perceptibility in different environments. The CsPbBrxI3–x/organic semiconductor hybrid films produced by spin coating are beneficial to large-scale fabrication. This study fabricates a novel solution-processable light-stimulated synapse based on inorganic perovskites for mimicking the human sensory adaptation that makes it possible to approach artificial neural sensory systems.
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高影响因子
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
·
2021
·Vol. 54
·期 2
·71-80
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IF 1.462
Yufei Yang,Yadong Zhang
In this work, a HPW/ZSM-5 catalyst was prepared by impregnating phosphotungstic acid (HPW) with carrier ZSM-5 zeolite and characterized by XRD, SEM, N 2 adsorption/desorption isotherm, NH 3 -TPD, and FT-IR techniques. The catalytic performance of HPW/ZSM-5 was investigated by using the decomposition reaction of cyclohexylbenzene-1-hydroperoxide (CHBHP) to phenol and cyclohexanone. The conversion rate of CHBHP was up to 97.28%. In addition, the reusability test exhibited that the high durability HPW/ZSM-5 as the conversion rate of CHBHP only decreased by 3.11% after five runs. The kinetic study of the decomposition reaction indicated it was a primary reaction. The apparent activation energy of the decomposition reaction was 102.39 kJ·mol –1 in the temperature range of 45–60℃. All results indicate that the HPW/ZSM-5 catalyst has good performance and promising applications in acid catalyzed organic chemistry.
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Functional Materials Letters
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2021
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IF 2.17
Jian Su,Xiaohong Zheng,Xianzhong Lang,Rui Han,Hongkun Cai,Jian Ni,Jianjun Zhang,Jianhua Qiu
The solution process is currently the most common method for preparing perovskite solar cells; however, their performance, even when prepared by the same procedure, is variable. One contributing factor is neglecting the ageing time of the perovskite precursor ink. In this study, we studied the correlation between the precursor solution ageing time and the subsequent photovoltaic performance of solar cells. We found that both freshly made and excessively aged precursor solutions resulted in poor perovskite films, exhibiting poor absorption and increased recombination sites. An ageing time of 6 h was optimal, which resulted in photovoltaic devices with greater performance, stability and reproducibility.
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Nature Communications
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2021
·Vol. 12
·期 1
·1-10
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IF 14.919
Peng Jiali,Xia Chelsea Q.,Xu Yalun,Li Ruiming,Cui Lihao,Clegg Jack K.,Herz Laura M.,Johnston Michael B.,Lin Qianqian
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics. In particular, perovskite single crystals have emerged as promising candidates for ionization radiation detection, due to the excellent opto-electronic properties. However, most of the reported crystals are grown in organic solvents and require high temperature. In this work, we develop a low-temperature crystallization strategy to grow CsPbBr 3 perovskite single crystals in water. Then, we carefully investigate the structure and optoelectronic properties of the crystals obtained, and compare them with CsPbBr 3 crystals grown in dimethyl sulfoxide. Interestingly, the water grown crystals exhibit a distinct crystal habit, superior charge transport properties and better stability in air. We also fabricate X-ray detectors based on the CsPbBr 3 crystals, and systematically characterize their device performance. The crystals grown in water demonstrate great potential for X-ray imaging with enhanced performance metrics.
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Optical Materials Express
·
2021
·Vol. 11
·期 4
·1004-1013
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IF 3.442
Hongliang Zhao,Tengteng Li,Qingyan Li,Chengqi Ma,Jie Li,Chenglong Zheng,Yating Zhang,Yating Zhang,Jianquan Yao,Jianquan Yao
The monolithic stacked design is expected to solve the challenges of wiring difficulties, complex fabrication processes, and low resolution. However, a photodetector array with low operating voltage that is suitable for imaging applications has not been proposed. Here, a perovskite photodetector array with a monolithic stacked structure is proposed. The CH3NH3PbI3 photodetector has a low power consumption off-state (0 V) and on-state (−2 V) voltage, and the highest responsivity and specific detectivity of 0.39 A/W and 4.53×1012 Jones at 775 nm, respectively. The rise time and decay time are 111 µs and 250 µs respectively. In addition, the imaging application shows high contrast, which provides a simple and effective way to prepare high performance perovskite imaging devices.
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CHEMOSPHERE
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2021
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IF 7.086
Qi Yu,Jingyi Feng,Jie Li,Anfei He,G. Daniel Sheng
Surface oxygen-containing functional groups (OFGs) at different sites of carbonaceous materials showed different effects on the normalized monolayer adsorption capacity ( Q BET/A ) obtained from the modified BET model. The OFGs on mesoporous surfaces inhibited the adsorption via the water competition, whereas those on the external surface promoted the adsorption due to the enhanced hydrophobic driving force and electrostatic forces, as analyzed from the adsorption molar free energy. Multiple linear relationships were established between the monolayer adsorption capacity Q BET/A and the amounts of OFGs on mesoporous and the external surfaces ( [O] meso and [O] external , respectively). The properties of aromatic adsorbate compounds, the polar area radio of aromatic molecule to water ( PA ad/w ), and the log K ow together influenced the inhibition or promotion effects of OFGs. These results would allow predictions of adsorption behavior of aromatic compounds on carbonaceous materials on the basis of OFGs parameters. Theoretical calculations and simulations projected the configuration of aromatic molecules being parallel to the graphene sheets of carbonaceous materials. The symmetry-adapted perturbation theory (SAPT) energy decomposition showed that the electrostatic forces intensified with the increase of adsorbate polarity. These analyses revealed that the electrostatic forces were enhanced in the presence of OFGs and that the π-π EDA (electron donor-acceptor) was the main force.
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SYNTHETIC METALS
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2021
·
IF 3.266
Zixiong Liu,Rong Hu,Junsheng Yu,Ruilin Wang,Jiang Cheng,Ming-ming Huo,Taiqi Wu,Lu Li
To improve the morphology and charge transport property of zinc oxide (ZnO) interface layer in the field of organic solar cells (OSCs), a novel ZnO sol-gel precursor was developed by redox reaction among zinc powder (Zn), hydrogen peroxide (H 2 O 2 ), and ammonia (NH 3 ·H 2 O) in aqueous solvent. This aqueous ZnO sol-gel precursor has advantages in cost and stability. Furthermore, photoelectric conversion performance of OSCs with ZnO layer (aqueous) is better than that of device with ZnO layer (nonaqueous). To further elaborate the relevance between the ZnO interface layer and the device performance, optical and morphology characteristics of precursor solutions, ZnO layers, and active layers were studied. Meanwhile, electrical characteristics of the OSCs were also analyzed. The results show less anion and larger colloidal particle size in aqueous sol-gel solution, which making the ZnO interface layer have fewer defects and larger surface roughness than nonaqueous-phase prepared ZnO layer. Thus, free electron could transfer from the active layer to ZnO layer more easily, and charge recombination is reduced at the interface. Moreover, the electron mobility of OSCs is also enhanced by the aqueous-phase prepared ZnO layer. Therefore, short-circuit current and photoelectric conversion performance of device are promoted.
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JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 11
·6414-6425
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IF 1.938
Fan Wentao,Du Yongqiang,Zhou Jianjun,Ma Xueqing,Liu Yingliang,Xu Shengang,Cao Shaokui
The introduction of polymer additives provides a simple effective method to modify perovskite grain boundaries to improve power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). In this work, the high-quality methylammonium lead triiodide (MAPbI 3 ) perovskite film is prepared by adding the protonated polyamide-amine dendrimer (NH 3 + -PAMAM) to the perovskite precursor solution to regulate the crystalline growth process. The cross-linked perovskite grain structure induced by dendritic NH 3 + -functionalized PAMAM macromolecules results in the formation of compact and pinhole-free perovskite film owing to the suppression of perovskite gain boundaries. Finally, the unsealed NH 3 + -PAMAM modified PSC device achieves the highest PCE value of 16.03%, representing an increase of 48% compared with the control PSC device. Also, the unencapsulated NH 3 + -PAMAM-modified PSC device retained 75% of initial PCE value after being exposed to an ambient environment for 20 days, which is obviously higher than 10% for the control device. The improvements of perovskite morphology and photovoltaic performance are attributed to the modification of NH 3 + -PAMAM dendrimers. Graphic abstract
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Junfu Ma,Hongli Liu,Huayu Bao,Xianggao Li,Shirong Wang
The high cost of Spiro-OMeTAD and the poor stability of devices remain a critical challenge for commercialization of perovskite solar cells (PSCs). Hence, the development of efficient hole-transporting materials (HTMs) seems imperative. Herein, three alkyls-modified HTMs named BTPA-C, BTPA-3C and BTPA-8C were designed and synthesized. Through tailoring their alkyl side-chain length, the structure-property relationships such as photophysical, electrochemical properties and the photovoltaic performance of corresponding PSCs were systematically investigated. Results demonstrate that the HTMs exhibit similar energy level, absorption and emission spectra. However, through tailoring their alkyl side-chain length, the film-forming and hole-transporting ability of HTMs can be greatly affected. Compared to BTPA-C or BTPA-8C, BTPA-3C with a moderate side chain length was endowed with the highest PCE of 18.60%, which was even comparable to that of PSCs based on Spiro-OMeTAD. Meanwhile, compared to the latter, PSCs based on BTPA-3C exhibited significantly improved stability at a relative humidity of 45 ± 5%, maintaining more than 80% of the initial efficiency after aging for 30 days.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lin Fan,Pengfei Wang,Mingyue Wang,Wanhong Lü,Fengyou Wang,Huilian Liu,Jinghai Yang,Lili Yang
In the development of high-efficiency n-i-p planar heterojunction perovskite solar cells (PSCs), the development of dense electron-transporting layers (ETLs) with excellent electrical properties and hetero-interface quality is very important for promoting perovskite growth and carrier transport dynamics. Herein, we propose a simple and effective strategy to simultaneously improve the electronic properties and interface quality of a tin oxide (SnO 2 ) ETL by introducing 2-hydroxyethyl modified gold nanostars (HEPES-Au NSs) into a commercial SnO 2 colloidal dispersion in order to synthesize mixed ETLs at low temperatures (≤150 ℃). Based on the unique plasmonic structure of the HEPES-Au NSs, we demonstrate that the modified ETLs exhibit higher conductivity and greater efficiency in the extraction, transfer, and collection of photogenerated electrons than conventional SnO 2 ETLs. Moreover, the chemical bond interaction between HEPES-Au NSs and the perovskite enhances the affinity of the SnO 2 /perovskite hetero-interface, which effectively improves the nucleation and crystallization kinetics of the perovskite, thus producing a high-quality absorber with high crystallinity and superior absorbance. Meanwhile, the 2-hydroxyethyl (HEPES) adsorbed onto the SnO 2 surface effectively passivates perovskite-related trap states, suppressing the non-radiative recombination and leakage current, and ultimately improving the relative electronic properties and photovoltaic performance output of the modified device. The results show that the power conversion efficiency (PCE) of the modified PSCs is significantly better than that of the original SnO 2 -based planar devices, and the optimal PCE reached 21.13%, with negligible hysteresis. Additionally, owing to the multifunctional effects of SnO 2 modified by HEPES-Au NSs, the functionalized devices without encapsulation also demonstrate reliable reproducibility and good stability, which shows great advantages in the development of high-efficiency flexible PSCs and monolithic tandem devices.
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