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( Sushil Bagde ),박한옥,이수형 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Intermolecular interactions have a critical role in determining the molecular packing and orientation of small molecule, leading to significant changes in their electrical and optical properties. Herein, we present two π-conjugated small molecules for use in solution-processed organic solar cells (OSCs) to elucidate the effect of terminal donor groups on the performance of benzodithiophene (BDT) based small molecules. Each small molecules have different terminal donor groups of hexylbithiophene (BDT(TTBT)2) or hexylphenyl-thiophene (BDT(PTBT)2). Various investigations into the molecules reveal that variation of the terminal groups not only influence the optical and electronic properties but also affect crystallization and morphology of the small molecules. BDT(TTBT)2 shows efficiency of 1.73% as a consequence of deep HOMO (Voc =0.81 V), improved charge delocalization and stronger light absorption (Jsc=4.75 mA/cm-2), when mild annealing was used as a result of improved texturing structures in morphology. BDT (PTBT)2 device rather shows moderate PCE of 1.22% with Jsc of 2.88 mA cm-2, Voc of 0.81V and FF of 0.52.
한장군,( Sushil Bagde ),이수형 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Three small molecules, composed of two dimensional NDT donor core and end-capped with electron deficient unit such as TPD, Ester and Amide group, defined as 2D-NDT(TPD)2, 2D-NDT(Ester)2 and 2D-NDT (Amide)2 were designed and synthesized. The optical, electrochemical, morphological and photovoltaic properties of these small molecules were characterized and investigated. When organic solar cells were fabricated using these small molecules, the morphology of 2D-NDT (Ester)2 or 2D-NDT(Amide)2 and PC<sub>71</sub>BM blend film was optimized using a DIO additive. A device based on 2D-NDT(Ester)2:PC<sub>71</sub>BM(1:1, 1% DIO) shows efficiency of 1.22% with Jsc of 3.75 mA/㎠, Voc of 0.91V and FF of 35.50. Similarly for 2D-NDT(Amide)2:PC<sub>71</sub>BM(1:3, 1% DIO) device efficiency of 0.55%, with Jsc of 2.36 mA/㎠, Voc of 0.64V and FF of 36.95 was observed. Finally for 2D-NDT(TPD)2:PC<sub>71</sub>BM(1:2) device, efficiency restricted to 0.33% with Jsc of 1.66 mA/㎠, Voc of 0.73V and FF of 27.2.
이송미,( Sushil Bagde ),박한옥,이수형 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Two new small molecules, based on diketopyrrolopyrrole core flanked by cyanothiophene units (CN-DPP-CN, CN-TH-DPP-TH-CN) were synthesized by Suzuki coupling and explored as donors in solution processed organic solar cells (OSCs). The HOMO/LUMO energy levels of CN-DPP-CN, CN-TH-DPP-TH-CN having moderate band gap of 1.83 eV and 1.44 eV were estimated to be -5.63/-3.84 eV, -5.20/-3.75 eV respectively. The device efficiency was found to be 0.013, 0.21% for CN-DPP-CN, CN-TH-DPP-TH-CN respectively for BHJ solar cells. When CN-DPP-CN (0.05%) was added in P3HT:PC60BM device, its PCE was enhanced from 2.08% to 2.45% signifying its ability to be used as a potential n-type additive.
Ambade, Swapnil B.,Ambade, Rohan B.,Bagde, Sushil S.,Eom, Seung Hun,Mane, Rajaram S.,Shin, Won Suk,Lee, Soo-Hyoung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.4
<P>1-D ZnO represents a fascinating class of nanostructures that are significant to optoelectronics. In this work, we investigated the use of an eco-friendly, metal free in situ doping through a pure thiophene-sulfur (5) on low temperature processed (<95 degrees C) and annealed (<170 degrees C), planar 1-D ZnO nanorods (ZnRs) spin-coated as a hole blocking and electron transporting layer (ETL) for inverted organic solar cells (iOSCs). The TEM, HRTEM, XPS, FT-IR, EDS and Raman studies clearly reveal that the thiophene-S (Thi-S) atom is incorporated on planar ZnRs. The investigations in electrical properties suggest the enhancement in conductivity after Thi-S doping on 1-D ZnRs. The iOSCs of poly.(3-hexylthiophene-2,5-diyl) and phenyl-C-61-butyric acid methyl ester (P3HT: PC60BM) photoactive layer containing thiophene-S doped planar ZnRs (Thi-S-PZnRs) as ETL exhibits power conversion efficiency (PCE) of 3.68% under simulated AM 1.5 G, 100 mW cm(-2) illumination. The similar to 47% enhancement in PCE compared with pristine planar ZnRs (PCE = 2.38%) ETL is attributed to a combination of desirable energy level alignment, morphological modification, increased conductivity and doping effect. The universality of Thi-S-PZnRs ETL is demonstrated by the highest PCE of 8.15% in contrast to 6.50% exhibited by the iOSCs of ZnRs ETL for the photoactive layer comprising of poly[4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b;4,5-b]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] : phenyl-C71-butyric acid methyl ester (PTB7-Th: PCB71M). This enhancement in PCE is observed to be driven mainly through improved photovoltaic parameters like fill factor (ff) as well as photocurrent density (J(sc)), which are assigned to increased conductivity, exciton dissociation, and effective charge extraction, while; better ohmic contact, reduced charge recombination, and low leakage current density resulted in increased Voc.</P>