500907-22-2Relevant academic research and scientific papers
Stable negative differential resistance in porphyrin based σ-π-σ monolayers grafted on silicon
Garg, Kavita,Majumder, Chiranjib,Gupta, Shiv Kumar,Aswal, Dinesh Kumar,Nayak, Sandip Kumar,Chattopadhyay, Subrata
, p. 50234 - 50244 (2015/06/25)
Two Si-based hybrid self-assembled monolayers were synthesized by electro-grafting two di-O-alkylated porphyrins as the σ-π-σ systems. The monolayers showed a stable and reversible negative differential resistance (NDR) property at room temperature. The monolayer, fabricated using the porphyrin with fluorophenyl groups was more compact and showed a tenfold peak-to-valley ratio (PVR) relative to the other similar system devoid of the fluorine atoms in the porphyrin moiety. This suggested better pre-organization of the former, possibly by hydrogen bonding through the electro-negative fluorine atoms.
Molecular engineering of boryl oxasmaragdyrins through peripheral modification: Structure-efficiency relationship
Mane, Sandeep B.,Hung, Chen-Hsiung
, p. 4825 - 4841 (2015/03/18)
Expanded porphyrins with the absorption profile down to the infrared region through increased p-conjugation are suitable candidates for a low energy sensitizer. Oxasmaragdyrin boron complexes, a class of aromatic-coremodified expanded porphyrin with 22 π -electrons, have been recently utilized as an efficient low energy sensitizer in dye-sensitized solar cells. In this paper, we have prepared a series of eight novel boryl oxasmaragdyrins through molecular engineering on the periphery and their overall photovoltaic performances in dye-sensitized solar cells are evaluated. With the help of photophysical, electrochemical, and photovoltaic studies, it is revealed that molecular structure, especially the number and position of the donor-acceptor groups play a pivotal role in their photovoltaic performance. Presence of the two well-separated split Soret bands in the 400-500 nm region of UV/Vis spectrum ensures broader coverage of absorption wavelengths. Even though the two-an-choring-group dyes (SM5-SM8 ) bind strongly to TiO2 compared to one-anchoring-group dyes (SM1-SM4), the latter have superior photovoltaic performance than the former. Dye SM1 , with two hexyloxyphenyl donors and one carboxylic acid anchor showed the best overall conversion efficiency of 4.36% (JSC = 10.91 mAcm-2 ; VOC = 0.59 V; FF = 0.68). This effective modulation of photovoltaic performance through structural engineering of the dyes will serve as a guideline for the future design of efficient low energy light-harvesting sensitizers.
BODIPY-based conjugated polymers for broadband light sensing and harvesting applications
Cortizo-Lacalle, Diego,Howells, Calvyn T.,Gambino, Salvatore,Vilela, Filipe,Vobecka, Zuzana,Findlay, Neil J.,Inigo, Anto R.,Thomson, Stuart A. J.,Skabara, Peter J.,Samuel, Ifor D. W.
experimental part, p. 14119 - 14126 (2012/09/22)
The synthesis of novel low band-gap polymers has significantly improved light sensing and harvesting in polymer-fullerene devices. Here the synthesis of two low band-gap polymers based on the 4,4-difluoro-4-bora-3a,4a-diaza-s- indacene core (BODIPY), and
Design and synthesis of light-harvesting rods for intrinsic rectification of the migration of excited-state energy and ground-state holes
Loewe, Robert S.,Lammi, Robin K.,Diers, James R.,Kirmaier, Christine,Bocian, David F.,Holten, Dewey,Lindsey, Jonathan S.
, p. 1530 - 1552 (2007/10/03)
We present the design of molecular materials for ultimate use in solid-state solar cells. The molecular materials are semi-rigid oligomeric rods of defined length with metalloporphyrins in the backbone and a carboxy group at one end for attachment to a su
