Paidi Yella Reddy
Indian Institute of Chemical Technology
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Featured researches published by Paidi Yella Reddy.
Energy and Environmental Science | 2009
Lingamallu Giribabu; Challuri Vijay Kumar; Chikkam Srinivasa Rao; Veeranagari Gopal Reddy; Paidi Yella Reddy; Malapaka Chandrasekharam; Yarasi Soujanya
Two efficient heteroleptic ruthenium (II) complexes, cis-di(thiocyanato)(4,4′-dicarboxylic acid-2,2′-bipyridine)(4,4′-bis(2-(3,5-di tert-butylphenyl)ethenyl)-2,2′-bipyridine) ruthenium (II) (HRD-1) and cis-di(thiocyanato)(4,4′-dicarboxylic acid-2,2′-bipyridine)(4,4′-bis(2-(2,3,5-trimethylphenyl)ethenyl)-2,2′-bipyridine) ruthenium (II) (HRD-2) were synthesized and characterized, which when anchored onto nanocrystalline TiO2 shows efficiency of 5.77 and 4.87% respectively, using durable redox electrolytes.
Physical Chemistry Chemical Physics | 2016
Peng Gao; Kyung Taek Cho; Antonio Abate; Giulia Grancini; Paidi Yella Reddy; M. Srivasu; M. Adachi; A. Suzuki; K. Tsuchimoto; Michael Grätzel; Mohammad Khaja Nazeeruddin
A new Zn(ii) phthalocyanine (Pc) based low bandgap HTM is introduced for perovskite solar cells. Steady state and time-resolved photoluminescence (PL) measurements indicated an evenly matched hole extraction efficiency between sym-HTPcH and spiro-OMeTAD. On account of the low film quality and resulting high recombination, Zn(ii) Pc normally cannot work as an effective HTM. We adopted insulating Al2O3 for the infiltration of sym-HTPcH to form a hybrid interfacial buffer layer, affording perovskite solar cells (PSCs) with an average PCE value of up to 12.3%, which is a significant improvement with respect to the control cell without the meso-Al2O3 layer (4.21%) and is the highest value ever reported for Zn(ii) phthalocyanine based devices under AM1.5G standard conditions. A hysteresis test revealed that our device structure with the new HTM exhibited a balanced charge extraction behaviour.
Advances in Optoelectronics | 2011
Lingamallu Giribabu; Varun Kumar Singh; Challuri Vijay Kumar; Yarasi Soujanya; Veerannagari Gopal Reddy; Paidi Yella Reddy
A new high molar extinction coefficient organic-ruthenium(II) polypyridyl complex sensitizer (RD-Cou) that contains 2,2,6,6-tetramethyl-9-thiophene-2-yl-2,3,5,6,6a,11c-hexahydro1H,4H-11oxa-3a-aza-benzoanthracene-10-one as extended 𝜋-conjugation of ancillary bipyridine ligand, 4,4-dicaboxy-2,26,2-bipyridine, and a thiocyanate ligand in its molecular structure has been synthesized and completely characterized by CHN, Mass, 1H-NMR, UV-Vis, and fluorescence spectroscopies as well as cyclic voltammetry. The new sensitizer was tested in dye-sensitized solar cells using a durable redox electrolyte and compared its performance to that of standard sensitizer Z-907.
Advances in Optoelectronics | 2011
Malapaka Chandrasekharam; Ganugula Rajkumar; Chikkam Srinivasa Rao; Thogiti Suresh; Yarasi Soujanya; Paidi Yella Reddy
Two new ruthenium(II) mixed ligand terpyridine complexes, “Ru(Htcterpy)(NCS)(L1) (N(C4H9)4), mLBD1” and Ru(Htcterpy)(NCS)(L2)(N(C4H9)4), mLBD2 were synthesized and fully characterized by UV-Vis, emission, cyclic voltammogram, and other spectroscopic means, and the structures of the compounds are confirmed by 1H-NMR, ESI-MASS, and FT-IR spectroscopes. The influence of the substitution of L1 and L2 on solar-to-electrical energy conversion efficiency (η) of dye-sensitized solar cells (DSSCs) was evaluated relative to reference black dye. The dyes showed molar extinction coefficients of 17600 M−1 cm−1 for mLBD1 and 21300 M−1 cm−1 for mLBD2 both at λ maximum of 512 nm, while black dye has shown 8660 M−1 cm−1 at λ maximum of 615 nm. The monochromatic incident photon-to-collected electron conversion efficiencies of 60.71% and 75.89% were obtained for mLBD1 and mLBD2 dyes, respectively. The energy conversion efficiencies of mLBD1 and mLBD2 dyes are 3.15% (𝐽SC=11.86 mA/cm2, 𝑉OC=613 mV, ff=0.4337) and 3.36% (𝐽SC=12.71 mA/cm2, 𝑉OC=655 mV, ff=0.4042), respectively, measured at the AM1.5G conditions, the reference black dye-sensitized solar cell, fabricated and evaluated under identical conditions exhibited η-value of 2.69% (𝐽SC=10.95 mA/cm2, 𝑉OC=655 mV, ff=0.3750).
Advances in Optoelectronics | 2011
Malapaka Chandrasekharam; Ganugula Rajkumar; Thogoti Suresh; Chikkam Srinivasa Rao; Paidi Yella Reddy; Jun-Ho Yum; Mohammad Khaja Nazeeruddin; Michael Graetzel
A new high molar extinction coefficient ruthenium(II) bipyridyl complex “cis-Ru(4,4-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,2-bipyridine)(2,2-bipyridine-4,4-dicarboxylic acid)(NCS)2, BPFC” has been synthesized and characterized by FT-IR, 1H-NMR, and ESI-MASS spectroscopes. The sensitizer showed molar extinction coefficient of 18.5×103 M−1cm−1, larger as compared to the reference N719, which showed 14.4×103 M−1cm−1. The test cells fabricated using BPFC sensitizer employing high performance volatile electrolyte, (E01) containing 0.05 M I2, 0.1 M LiI, 0.6 M 1,2-dimethyl-3-n-propylimidazolium iodide, 0.5 M 4-tert-butylpyridine in acetonitrile solvent, exhibited solar-to-electric energy conversion efficiency (η) of 4.65% (short-circuit current density (𝐽SC) = 11.52 mA/cm2, open-circuit voltage (𝑉OC) = 566 mV, fill factor = 0.72) under Air Mass 1.5 sunlight, lower as compared to the reference N719 sensitized solar cell, fabricated under similar conditions, which exhibited η-value of 6.5% (𝐽SC = 14.3 mA/cm2, 𝑉OC = 640 mV, fill factor = 0.71). UV-Vis measurements conducted on TiO2 films showed decreased film absorption ratios for BPFC as compared to those of reference N719. Staining TiO2 electrodes immediately after sonication of dye solutions enhanced film absorption ratios of BPFC relative to those of N719. Time-dependent density functional theory (TD-DFT) calculations show higher oscillation strengths for 4,4-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,2-bipyridine relative to 2,2-bipyridine-4,4-dicarboxylic acid and increased spectral response for the corresponding BPFC complex.
Advances in Optoelectronics | 2012
Malapaka Chandrasekharam; Ganugula Rajkumar; Thogiti Suresh; Paidi Yella Reddy
A new high molar extinction coefficient ruthenium(II) bipyridyl complex, “Ru(2,2-bipyridine-4,4′-dicarboxylic acid)(4,4′-bis((3-hexylthiophen-2-yl)ethynyl)-2,2′-bipyridine)(NCS)2 (N(C4H9)4), MC101” was synthesized and fully characterized by 1H-NMR, ESI-MASS, FT-IR, UV-Vis., and fluorescence spectroscopes. The dye showed relatively high molar extinction coefficient of 25.0 × 103 M-1 cm-1 at λ maximum of 544 nm, while the reference C101 has shown 15.8 × 103 M-1cm-1 at λ maximum 528 nm. The monochromatic incident photon-to-collected electron conversion efficiency of 44.1% was obtained for MC101 over the entire visible range, while the C101 sensitized solar cell fabricated and evaluated under identical conditions exhibited 40.1%. The DSSCs fabricated with 0.54 cm2 active area TiO2 electrodes and high efficient electrolyte (E01), from the sensitizers MC101 and C101 exhibited energy conversion efficiencies of 3.25% (short-circuit current density (JSC) = 7.32 mA/cm2, VOC = 610 mV, ff = 0.725) and 2.94% (JSC = 6.60 mA/cm2; VOC = 630 mV; ff = 0.709), respectively, under air mass of 1.5 sunlight.
Angewandte Chemie | 2007
Paidi Yella Reddy; Lingamallu Giribabu; Christopher Lyness; Henry J. Snaith; Challuri Vijaykumar; Malapaka Chandrasekharam; Mannepalli Lakshmikantam; Jun-Ho Yum; Kuppuswamy Kalyanasundaram; Michael Grätzel; Mohammad Khaja Nazeeruddin
Dalton Transactions | 2011
Lingamallu Giribabu; Takeru Bessho; Mareedu Srinivasu; Challuri Vijaykumar; Yarasi Soujanya; Veeranagari Gopal Reddy; Paidi Yella Reddy; Jun-Ho Yum; Michael Grätzel; Mohammad Khaja Nazeeruddin
Advanced Energy Materials | 2017
Kyung Teak Cho; Olga Trukhina; Cristina Roldán-Carmona; Mine Ince; Paul Gratia; Giulia Grancini; Peng Gao; Tomasz Marszalek; Wojciech Pisula; Paidi Yella Reddy; Tomás Torres; Mohammad Khaja Nazeeruddin
Synthetic Metals | 2011
Malapaka Chandrasekharam; Ganugula Rajkumar; Chikkam Srinivasa Rao; Thogiti Suresh; Paidi Yella Reddy