Article
Chemistry, Physical
Kiran P. Shejale, Arun Jaiswal, Aditya Kumar, Sumit Saxena, Shobha Shukla
Summary: The high-quality nitrogen-doped carbon quantum dots (NCQDs) synthesized using domestic microwave-assisted pyrolysis method exhibit excellent physiochemical and optical properties, and when incorporated into the DSSC structure, they lead to improved performance with high photoconversion efficiency and photocurrent density.
Article
Chemistry, Applied
Zeinab Hezarkhani, Paria-Sadat Saei, Alireza Sabri, Fantai Kong, Rahim Ghadari
Summary: Doped carbon dots, specifically nitrogen-doped carbon dots (NCDs) and metal and nitrogen co-doped carbon dots ([M]NCDs), have been used to enhance the efficiency of porphyrin-sensitized solar cells (PSSCs). The substitution of porphyrins in the presence of NCDs as co-sensitizer has been studied and the use of ZnTCPP/NCDs has been found to have the greatest impact on solar cell performance. The results demonstrate the significance of impurity doping in carbon dots on the efficiency of PSSCs, with (Ni)NCDs and (Zn)NCDs showing the most improvement.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Physical
In-Rok Jo, Young-Hoon Lee, Hyunsoo Kim, Kwang-Soon Ahn
Summary: Nitrogen-doped graphene quantum dots (N-GQDs) play a crucial role in enhancing the performance of quantum dot-sensitized solar cells by boosting light absorption, facilitating electron transportation, and suppressing charge recombination, leading to a significantly improved power conversion efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Yatao Pan, Zhongran Wei, Mengdi Ma, Xin Zhang, Zhen Chi, Yulu He, Xiaojuan Wang, Xia Ran, Lijun Guo
Summary: This study synthesized nitrogen and phosphorus co-doped carbon dots (N, P-CDs) and investigated the effects of phosphorus doping on the optical and photoelectric properties. The introduction of phosphorus atoms significantly changed the electronic structure of N, P-CDs, extended the absorption spectrum, and improved the light-harvesting ability. The carrier dynamics were also studied, showing decreased carrier recombination and efficient transfer of photogenerated electrons.
Review
Chemistry, Physical
Akash S. Rasal, Sudesh Yadav, Anil A. Kashale, Ali Altaee, Jia-Yaw Chang
Summary: This review discusses the factors influencing the performance stability of QDSSCs and provides insights into the mechanisms causing degraded performances. It also presents cutting-edge strategies for improving the overall performance stability of QDSSCs.
Article
Chemistry, Multidisciplinary
Ikhtisham Mehmood, Abdul Hakim Shah, Sayed Ali Khan, Maryam Kiani, Noor Zamin Khan, Aamir Saeed, Ambreen Ayub, Fayaz Khan, Huang Jincheng, Sohail Muhammad, Le Jiang, Li Guijun, Simeon Agathopoulos
Summary: Metal doping, specifically Mg-doped CdS, was found to enhance the photovoltaic performance and stability of CISe QDSSCs. The ex-situ peptization technique was used for QD sensitization, with Mg-CdS passivation layer reducing current leakage and improving overall performance. The fabricated TiO2/CISe/Mg-CdS solar cell exhibited a promising power conversion efficiency of 4.65% under AM 1.5 G illumination.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Biophysics
Shitao Zhang, Chao Wang, Tingting Wu, Dawei Fan, Lihua Hu, Huan Wang, Qin Wei, Dan Wu
Summary: A sandwiched photoelectrochemical immunosensor based on BiOI/Bi2S3/Ag2S was designed for the quantitative detection of CYFRA21-1 in serum. The intervention of narrow band gap Bi2S3 enhanced light absorption, while the matched band structure of BiOI, Bi2S3 and Ag2S promoted rapid electron transfer, ultimately improving the photoelectric signals. Additionally, sulfur and nitrogen co-doped carbon quantum dots with up-conversion luminescence, along with polydopamine combined secondary antibody labels, further enhanced the sensor's sensitivity.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Physical
Anjan Kumar, Sabah Auda Abdul Ameer, Sura Mohammad Mohealdeen, Ahmed Hasoon, Yousra Ali Abdulsayed, Abdelmajeed Adam Lagum, Alaa M. Al-Ma'abreh, Mustafa M. Kadhim
Summary: Photosensitizers play a crucial role in the efficiency of dye-sensitized solar cells (DYSCs) by adjusting their electromechanical and optical properties. In this study, a photosensitizer called Flavan3-ol was proposed and modified using graphene quantum dots doped with nitrogen atoms (N-GQDs). The electronic, optical, and geometric properties of this photosensitizer were investigated using DFT and time-dependent DFT. The results showed that the modified Flavan3-ol met the requirements for DYSCs and could be potentially used in these solar cells.
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
D. Vinoth Pandi, V. Saraswathi, M. R. Venkatraman, N. Muthukumarasamy, S. Agilan, D. Velauthapillai, K. Brindhadevi, A. Pugazhendhi
Summary: PbS quantum dots and PbS quantum dots-sensitized ZnO nanostructures with rod-like shape were successfully synthesized. The prepared PbS quantum dots exhibited significant visible light absorption, and the light absorption of PbS quantum dots-sensitized ZnO nanorods was higher than that of bare ZnO nanorods. The uniform development of rod-like ZnO nanostructures with deposition of PbS quantum dots on the surface was observed from electron microscope images. The solar cells made using PbS quantum dots-sensitized ZnO nanorods achieved a power conversion efficiency of 1.2%.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Instruments & Instrumentation
Ouwen Xu, Wei Liu, Jiawei Li, Shuyu Wan, Xiashi Zhu
Summary: A novel nitrogen-doped carbon quantum dots (N-CDs) were prepared and the fluorescence quenching effect of Co(II) on N-CDs was sensitized in the SDS medium. The linear range for the determination of Co(II) was 0.17 μg/mL-11.8 μg/mL with a detection limit of 0.052 μg/mL. This method has been successfully applied for the determination of Co(II) in samples.
Article
Engineering, Electrical & Electronic
Tharmakularasa Rajaramanan, G. R. A. Kumara, Dhayalan Velauthapillai, Punniamoorthy Ravirajan, Meena Senthilnanthanan
Summary: This study focuses on synthesising and characterising Ni/N co-doped P25-TiO2 nanostructure electrodes for photovoltaic application. Enhanced light absorption and improved surface roughness of Ni/N co-doped TiO2 electrode contribute to the higher performance of the fabricated DSSCs. The increase in short circuit current density (JSC) is mainly responsible for the improved power conversion efficiency (PCE) of the co-doped device.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Energy & Fuels
T. Archana, S. Sreelekshmi, G. Subashini, A. Nirmala Grace, M. Arivanandhan, R. Jayavel
Summary: The study investigated the use of graphene quantum dots as a passivating layer for cadmium sulfide quantum dot-sensitized solar cells, which significantly enhanced the photoconversion efficiency of the QDSSCs.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Tamal Dey, Arup Ghorai, Soumen Das, Samit K. Ray
Summary: The choice of solvent used in the synthesis of nitrogen-doped graphene quantum dots (N-GQDs) significantly affects the photovoltaic performance of quantum dot sensitized solar cells (QDSSC). Switching to aprotic solvent DMF enhances nitrogen units in the graphene quantum dots framework, improving carrier density and transport properties, and resulting in better photovoltaic performance for QDSSC.
Article
Engineering, Electrical & Electronic
Jung-Chuan Chou, Ruei-Hong Syu, Po-Hui Yang, Po-Yu Kuo, Yu-Hsun Nien, Chih-Hsien Lai, Po-Feng Chen, Yi-Ting Wu, Shang-Wen Zhuang
Summary: We enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs) by introducing graphene quantum dots (GQDs). GQD emits green fluorescence (around 530 nm) in the ultraviolet wavelength range (around 340 nm), which is utilized to improve the light absorption ability of N719 dye. Co-sensitization of N719 dye with GQDs as auxiliary sensitizers enhances the photovoltaic performance of DSSCs. By measuring incident photon-to-current conversion efficiency (IPCE), we observe the photoresponse characteristics of DSSCs with different sensitization effects. The DSSCs with GQD+N719 co-sensitized photoanode show a 20% increase in photoelectric conversion efficiency, reaching 5.14%.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Rahim Ghadari, Alireza Sabri
Summary: A novel and facile hydrothermal route for preparing stable phthalocyanine supported on nitrogen and chlorine doped carbon dots (phthalocyanine@N/Cl-CDs) in water is reported. The phthalocyanine@N/Cl-CDs show high stability and have potential applications as sensitizing systems in dye-sensitized solar cells (DSSCs). Computational studies and experimental results confirmed that the N/Cl-CDs can act as effective co-sensitizers in phthalocyanine-sensitized solar cells (Pc-SSCs).
DIAMOND AND RELATED MATERIALS
(2023)
Article
Cell & Tissue Engineering
Shangping Wang, Pei-Chih Lee, Amanda Elsayed, Fan Zhang, Yong Zhang, Pierre Comizzoli, Gloria D. Elliott
Summary: The study characterized the impact of moisture content on DNA integrity within feline oocytes following dehydration, finding stable DNA integrity in GVs stored under specific microwave-assisted drying conditions. Directly processing samples to moisture contents consistent with the glassy state ensured optimal biostabilization for long-term storage of genetic resources.
CELLULAR AND MOLECULAR BIOENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Qiong Chen, Brandon S. McKeon, Sunny Y. Zhang, Fan Zhang, Changkui Hu, Timothy H. Gfroerer, Mark W. Wanlass, David J. Smith, Yong Zhang
Summary: This study uses a variety of spatially resolved techniques to investigate dislocation defects in GaAs solar cells, providing a quantitative and definitive correlation between the atomistic structure of defects and their effects on device performance, offering unprecedented insight into defect physics.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Antardipan Pal, Yong Zhang, Dennis D. Yau
Summary: This study presents a novel approach using hybrid 6T SRAM to address major challenges in integrating photonic and electronic elements, achieving improvements in switching speed and energy consumption.
PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Zhiqiang Liu, Bingyao Liu, Fang Ren, Yue Yin, Shuo Zhang, Meng Liang, Zhipeng Dou, Zhetong Liu, Shenyuan Yang, Jianchang Yan, Tongbo Wei, Xiaoyan Yi, Chaoxing Wu, Tailiang Guo, Junxi Wang, Yong Zhang, Jinmin Li, Peng Gao
Summary: This study investigates the polarity determination and evolution mechanism of polar wurtzite nitrides on nonpolar substrates. The findings reveal a spontaneous polarity inversion during the growth and the formation of inherent inverse grain boundaries. Additionally, it identifies the occurrence of vertical two-dimensional electron accumulation originating from the lattice symmetry breaking at the inverse grain boundary.
Article
Chemistry, Multidisciplinary
Chen Ming, Zhizhong Chen, Fan Zhang, Shuiping Gong, Xiaowei Wu, Jie Jiang, Tang Ye, Qing Xu, Ke Yang, Liang Wang, Xun Cao, Songwang Yang, Shengbai Zhang, Yong Zhang, Jian Shi, Yi-Yang Sun
Summary: Lead-free and defect-tolerant photovoltaic material CuBiSCl2 with stable properties and an ideal band gap has been discovered through computational screening and experimental synthesis. It shows strong absorption and good stability against high temperature and humidity.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Adam W. Earnhardt, Kevin M. Boyle, Tyler Adams, Michael G. Walter, Yizhou Wang, Yong Zhang, Adesola Adeyemi, Jon Merkert, Askhat N. Bimukhanov, Anuar A. Aldongarov, Colin D. McMillen, Thomas A. Schmedake
Summary: A hexacoordinate organosilane with a SiC4N2 skeleton has been synthesized and shown to have resistance to hydrolysis and thermal stability. Film experiments demonstrate its bipolar charge transport property, making it a potential material for device applications.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2022)
Article
Optics
Fan Zhang, Jose F. Castaneda, Timothy H. Gfroerer, Daniel Friedman, Yong-Hang Zhang, Mark W. Wanlass, Yong Zhang
Summary: The authors demonstrate an all optical approach that allows for obtaining various key parameters relevant to carrier recombination dynamics in semiconductor materials. By analyzing photoluminescence and Raman measurements, they can determine parameters such as internal quantum efficiency, carrier density, and defect center occupation fraction. This method greatly enhances the usefulness of photoluminescence technique without the need for device processing and can be used for comprehensive material and device characterization.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Editorial Material
Physics, Condensed Matter
Xiaoxing Ke, Yong Zhang
JOURNAL OF SEMICONDUCTORS
(2022)
Review
Physics, Condensed Matter
Yong Zhang, David J. Smith
Summary: In this article, a new approach to defect study is introduced, which involves a sequential mode application of spatially-resolved optical, electrical, and structural characterization techniques on fabricated devices. This approach provides definitive answers to questions regarding the impact of individual defects on device performance, the dependence of this impact on device operating conditions, and the variation of this impact between different defects.
JOURNAL OF SEMICONDUCTORS
(2022)
Review
Optics
Yong Zhang
Summary: The translation is about the crystalline properties of organic-inorganic hybrid materials, classifying them into four levels based on their deviation from the strict definition of crystals. It discusses the different levels of crystallinity and defects in these materials, and provides a brief review on II-VI based hybrids, comparing them with their inorganic counterparts and other hybrids. The future studies of these hybrids are also mentioned.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Electrical & Electronic
Cao Cheng, Chu Chen, Hongyan Zhang, Yong Zhang
Summary: An NH3 gas sensor based on ZnO/CuO heterojunctions was prepared using the hydrothermal method. The sensor exhibited excellent performance, including low detection limit, fast response/recovery time, high sensitivity, good selectivity, strong stability, and high humidity resistance at room temperature. The improved sensing performance is attributed to the presence of more oxygen free radicals and the strong adsorption energy of the ZnO/CuO heterojunctions. The strong built-in electric field of the heterojunctions enhances the polarity of NH3 molecules and induces a high response to NH3 molecules.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Optics
Xiaoxiao Sun, Yong Zhang, Weikun Ge
Summary: Contrary to common belief, the segregation of halide ions induced by light does not occur within the illuminated area in a mixed halide alloy. Instead, the released Br ions are expelled from the illuminated area, generating a ring of anions surrounding the illuminated area. This finding may be the first observation of an ionic plasma oscillation in solids.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Physical
Jose F. Castaneda, Jeong-Hyeok Im, Yucheng Liu, Shengzhong Liu, Nam-Gyu Park, Yong Zhang
Summary: Organic-inorganic hybrid perovskites exhibit excellent photovoltaic properties, but instability arises from the material's surface and photoexcitation. The photodegradation process of methylammonium lead triiodide (MAPbI(3)) was investigated using above bandgap excitation Raman spectroscopy, revealing two stages of structural change in polycrystalline films of different domain sizes and in a single crystal. The surface was found to act as a site for the accumulation of photogenerated carriers, leading to degradation and the formation of PbI2.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Mingfu Fu, Wen Yang, Kaixiang Du, Jiabao Li, Yong Zhang, Shukang Deng, Peizhi Yang
Summary: This study successfully fabricated Sb-doped BP and Bi-doped BP using the constant temperature CVT method to enhance their performance. The results showed that the light absorption and electrochemical properties of orthorhombic BP were improved by doping, and Sb-BP exhibited outstanding antioxidation performance. This work provides useful guidance for preparing other doped BP and BP compounds, broadening the application field of the phosphorus family.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Biotechnology & Applied Microbiology
Joseph A. Orozco Cabral, Pei-Chih Lee, Shangping Wang, Yizhou Wang, Yong Zhang, Pierre Comizzoli, Gloria D. Elliott
Summary: Adding choline acetate during dehydration can expand the humidity range for storage of oocytes' nuclei, without compromising DNA integrity, and help maintain an amorphous state.
BIOENGINEERING-BASEL
(2023)
