Control the crystal size by varying concentrations of precursors for the planar perovskite solar cells

Xie, Lin,Hwang, Heewon,Kim, Minjung,Kim, Kyungkon Korean Society of Photoscience 2015 Rapid communication in photoscience Vol.4 No.4

The influence of the grain size of the $CH_3NH_3PbI_3$ on the solar cell performance is investigated by controlling the ratio between $CH_3NH_3I$ and $PbI_2$ precursors. As the concentration of the precursors increased from 1.0M to 2.0M, the $CH_3NH_3PbI_3$ grain size increased from ~100nm to ~400nm. The solar cell utilizing the $CH_3NH_3PbI_3$ with large grain size shows improved photocurrent compared to the solar cell utilizing $CH_3NH_3PbI_3$ with small grain size, which is ascribed to the reduced recombination at the boundaries of grains.

Disease burden of prostate cancer from 2014 to 2019: estimation from the Global Burden of Disease Study 2019 and Medical Expenditure Panel Survey

Lin Shen,Lin Dong,Li Yiyuan,Zhong Lixian,Zhou Wei,Wu Yajing,Xie Chen,Luo Shaohong,Huang Xiaoting,Xu Xiongwei,Weng Xiuhua 한국역학회 2023 Epidemiology and Health Vol.45 No.-

OBJECTIVES The aim of this study was to evaluate the disease burden of prostate cancer (PC) and assess key influencing factors associated with the disease expenditures of PC in the United States. METHODS The total deaths, incidence, prevalence, and disability-adjusted life-years of PC were obtained from the Global Burden of Disease Study 2019. The Medical Expenditure Panel Survey was used to estimate healthcare expenditures and productivity loss and to investigate patterns of payment and use of healthcare resources in the United States. A multivariable logistic regression model was conducted to identify key factors influencing expenditures. RESULTS For patients aged 50 and older, the burden for all age groups showed a modest increase over the 6-year period. Annual medical expenditures were estimated to range from US$24.8 billion to US$39.2 billion from 2014 to 2019. The annual loss in productivity for patients was approximately US$1,200. The top 3 major components of medical costs were hospital inpatient stays, prescription medicines, and office-based visits. Medicare was the largest source of payments for survivors. In terms of drug consumption, genitourinary tract agents (57.0%) and antineoplastics (18.6%) were the main therapeutic drugs. High medical expenditures were positively associated with age (p=0.005), having private health insurance (p=0.016), more comorbidities, not currently smoking (p=0.001), and patient self-perception of fair/poor health status (p<0.001). CONCLUSIONS From 2014 to 2019, the national real-world data of PC revealed that the disease burden in the United States continued to increase, which was partly related to patient characteristics.

Improved Efficiency by Insertion of TiO2 Interfacial Layer in the Bilayer Solar Cells

Lin Xie,Soyeon Yoon,Kyungkon Kim 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.2

EFFECTIVE SYNTHESIS AND APPLICATION OF ZAO NANOPARTICLES WITH GOOD DISPERSION

LIN-LIN ZHANG,HONG-ZHEN XIE,MIN ZHANG,JIN-KU LIU,XIAO-HONG YANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3

The well dispersed ZAO nanoparticle with 25?30 nm in diameter was prepared by an ultrasonictemplate method. The morphologies, structures, and photoelectricity of the ZAO nanoparticles were analyzed by TEM, XRD, UV-Vis, etc. The thermochemistry behaviors of the precursor were studied by TG-DSC. The composite ¯lm with semipermeable structure made from ZAO nanoparticles and collodion can be explored ¯rstly. The photocatalytic properties of the ZAO nanoparticles and composite ¯lm were investigated. The composite ¯lm can be applied in the sewage treatment ¯eld.

Efficient and Reproducible CH₃NH₃PbI₃ Perovskite Layer Prepared Using a Binary Solvent Containing a Cyclic Urea Additive

Xie, Lin,Cho, An-Na,Park, Nam-Gyu,Kim, Kyungkon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.11

<P>An efficient CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cell whose performance is reproducible and shows reduced dependence on the processing conditions is fabricated using the cyclic urea compound 1,3-dimethyl-2-imidazolidinone (DMI) as an additive to the precursor solution of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>. X-ray diffraction analysis reveals that DMI weakly coordinates with PbI<SUB>2</SUB> and forms a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> film (film-DMI) with no intermediate phase. The surface of annealed film-DMI (film-DMI-A) was smooth, with an average crystal size of 1 μm. Photoluminescence and transient photovoltage measurements show that film-DMI-A exhibits a longer carrier lifetime than a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> film prepared using the strongly coordinating additive dimethyl sulfoxide (DMSO) (film-DMSO-A) because of the reduced number of defect sites in film-DMI-A. A solar cell based on film-DMI-A exhibits a higher power conversion efficiency (17.6%) than that of a cell based on film-DMSO-A (15.8%). Furthermore, the performance of the film-DMI-A solar cell is less sensitive to the ratio between PbI<SUB>2</SUB> and DMI, and film-DMI can be fabricated under a high relative humidity of 55%.</P> [FIG OMISSION]</BR>

Organic Photovoltaics Utilizing a Polymer Nanofiber/Fullerene Interdigitated Bilayer Prepared by Sequential Solution Deposition

Xie, Lin,Lee, Ji Sang,Jang, Yoonhee,Ahn, Hyungju,Kim, Yun-Hi,Kim, Kyungkon American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.24

<P>Organic photovoltaics (OPVs) utilizing an interdigitated bilayer of an alkoxynaphthalene-based polymer nanofiber/fullerene have been developed by the sequential solution deposition (SqD) process. Spin-coating a polymer solution incorporated with 1-chloronaphthalene (1-CN) results in the formation of dense polymer nanofibers with diameters of 30-50 nm. The fullerene top layer is sequentially deposited onto the polymer nanofiber bottom layer to form a bulk heterojunction (BHJ) through the interdiffusion of fullerene. Compared to a plane polymer bottom layer, the preformed polymer nanofiber bottom layer provides effective interdiffusion of phenyl-C71-butyric acid methyl ester (PCBM) by facilitating the fast swelling of the PCBM solvent into the polymer bottom layer. The SqD processed OPV utilizing a polymer nanofiber/fullerene bilayer exhibits higher photocurrent density compared to those utilizing a plane polymer layer/fullerene bilayer. Furthermore, the SqD OPV exhibited superior solar cell performance to the OPV prepared by the polymer:fullerene blend solution deposition (BSD) process. Optical, morphological, and J V investigations on the photoactive layers reveal that improved ordering of the polymer chain with proper direction and increased heterojunction area are the main contributors to the superior solar cell performance. These results suggest an efficient interdigitated BHJ morphology can be realized by a sequentially deposited, preformed nanofiber/fullerene bilayer without a thermal annealing process.</P>

APPLICATION OF ROTHE'S METHOD TO A NONLINEAR WAVE EQUATION ON GRAPHS

Lin, Yong,Xie, Yuanyuan Korean Mathematical Society 2022 대한수학회보 Vol.59 No.3

We study a nonlinear wave equation on finite connected weighted graphs. Using Rothe's and energy methods, we prove the existence and uniqueness of solution under certain assumption. For linear wave equation on graphs, Lin and Xie [10] obtained the existence and uniqueness of solution. The main novelty of this paper is that the wave equation we considered has the nonlinear damping term |u_t|^p-1·u_t (p > 1).

Renal-targeting peptide-microRNA nanocomplex for near IR imaging and therapy of renal ischemia/reperfusion injury

Yongtao Lin,Mingyue Zhao,Lin Bai,Hailun Li,Yong Xu,Xiang Li,Juan Xie,Yiyuan Zhang,Donghui Zheng 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

Renal ischemia-reperfusion injury (RI/R) is one of the main causes of acute renal injury and a commonclinical disease with high morbidity and mortality. It is of great significance to deliver microRNAs(miRNAs) to cells and in vivo to realize gene regulation and treatment of related diseases. In this study, wereported that the nanocomplex FMN-17 could realize both therapeutic and functional monitoringsimultaneously in vivo and in vitro. The nanocomplex comprised a cationic cell-penetrating peptidenona-arginine, a targeting ligand folic acid, a caspase-3 responsive moiety, and a Cy imaging moiety. Thenanocomplex FMN-17 has been shown to deliver miR-17-5p efficiently and selectively into HK-2 cells andtissues. Treatment of HK-2 cells with the nanocomplex significantly increased the miR-17-5p level andinhibited apoptosis, as evident by reducing the expression of active caspase-3 and reactive oxygenspecies. Uptake of FMN-17 in vivo alleviated renal tissue injury by histological assessment. In summary,we designed and synthesized a new miRNA delivery system with high transfection efficiency, goodtherapeutic effect, and near-infrared imaging in renal ischemia/reperfusion injury.

Disease burden of prostate cancer from 2014 to 2019 in the United States: estimation from the Global Burden of Disease Study 2019 and Medical Expenditure Panel Survey

Shen Lin,Dong Lin,Yiyuan Li,Lixian Zhong,Wei Zhou,Yajing Wu,Chen Xie,Shaohong Luo,Xiaoting Huang,Xiongwei Xu,Xiuhua Weng 한국역학회 2023 Epidemiology and Health Vol.45 No.-

OBJECTIVES: The aim of this study was to evaluate the disease burden of prostate cancer (PC) and assess key influencing factors associated with the disease expenditures of PC in the United States. METHODS: The total deaths, incidence, prevalence, and disability-adjusted life-years of PC were obtained from the Global Burden of Disease Study 2019. The Medical Expenditure Panel Survey was used to estimate healthcare expenditures and productivity loss and to investigate patterns of payment and use of healthcare resources in the United States. A multivariable logistic regression model was conducted to identify key factors influencing expenditures. RESULTS: For patients aged 50 and older, the burden for all age groups showed a modest increase over the 6-year period. Annual medical expenditures were estimated to range from US$24.8 billion to US$39.2 billion from 2014 to 2019. The annual loss in productivity for patients was approximately US$1,200. The top 3 major components of medical costs were hospital inpatient stays, prescription medicines, and office-based visits. Medicare was the largest source of payments for survivors. In terms of drug consumption, genitourinary tract agents (57.0%) and antineoplastics (18.6%) were the main therapeutic drugs. High medical expenditures were positively associated with age (p=0.005), having private health insurance (p=0.016), more comorbidities, not currently smoking (p=0.001), and patient self-perception of fair/poor health status (p<0.001). CONCLUSIONS: From 2014 to 2019, the national real-world data of PC revealed that the disease burden in the United States continued to increase, which was partly related to patient characteristics.

Effect of key stratum on the mining abutment pressure of a coal seam

Jian-Lin Xie,Jia-Lin Xu 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2

This study investigates the effect of key stratum on the mining abutment pressure of a coal seam. Firstly, a total of 42 configurations with different key stratum thicknesses and heights have been numerically simulated by the Universal Distinct Element Code (UDEC) software. Then, through the analysis of two sets of parameters derived from the simulation results, the peak abutment pressure and the range of influence, shows that the effect of key stratum on the abutment pressure is conditional. For a relatively small key stratum thickness, less than 159 m, the effect on the abutment pressure is negligible unless the key stratum height is higher than the critical height of 421 m. On the other hand, for the key stratum thickness bigger than 159 m, the abutment pressure is affected irrespective of the key stratum height. Finally, in order to verify the simulation results, the abutment pressure of a field model has been analyzed. The analysis shows that the abutment pressure of the field model with a key stratum is 42% higher than that of the model without any key stratum. The stress at the field model has increased from the virgin stress of 14.6 MPa to the stress of 21.5 MPa. Meanwhile, the stress concentration coefficient has changed from 1 to 1.5, which caused the coal and gas burst disaster. The results of this study can be very useful to explain the reason for the occurrence of some dynamic disasters affected by the key stratum.