A new indolocabazole derivative possessing an extended aromatic core and solubilizing long aliphatic chains effectively self-assembles and crystallizes within the nanoscale channels to form single-crystal nanowires via a direct printing method from an ink solution. Single-crystal organic nanowire transistor arrays based on the π-extended indolocarbazole derivative exhibit an excellent hole mobility of 1.5 cm² V⁻¹ s⁻¹ and outstanding environmental stability.

PbS quantum dot-sensitized solar cells (QDSCs) with a photovoltaic conversion efficiency (η) of 5.73% have been fabricated by applying Au/CuS/FTO as a counter electrode (CE), post-annealing the deposited PbS QDs, and introducing the bilayered TiO2 nanostructure as a photoanode.

A solution based ion exchange mediated strategy for constructing 1-D arrays of porous CoS1.0365 nanorod film from analogous 1-D array of Co3O4 film derived from pyrolysis of nanostructured cobalt hydroxycarbonate film.

To date, Spiro-OMeTAD, which is an expensive organic compound, is used as the benchmark hole transporting materials (HTMs) in perovskite based solid state solar cells. Development of an inexpensive HTM and competitive performance to Spiro-OMeTAD is therefore significantly important for commercialization of perovskite cells. Herein, an indolocarbazole based small molecule derivative (C12-Carbazole) has been introduced as environmentally stable, cost effective and highly efficient HTM. In contrast to the power conversion efficiency of 9.62 % exhibited by the Spiro-OMeTAD based solid state solar cell, the C12-Carbazole based device under the same experimental conditions has demonstrated an enhanced power conversion efficiency of 11.26 %.The improved photovoltaic performance of the C12-Carbazole based device is attributed to the lowering of carrier recombination by better hole extraction ability of the C12-Carbazole, which has demonstrated remarkably higher hole mobility compared to Spiro-OMeTAD.

a Efficient charge separations and their mobility is a key challenge in metal-organic-frameworks (MOFs) based devices. In the present study, thin films of cobalt-based metal organic frameworks (MOFs) are synthesized using layer-by-layer technique, and their electrical/optoelectronic properties are studied. The as-prepared MOF films show electrically insulating behavior, which after hole doping demonstrate p-type conducting material. The measured HOMO-LUMO energy states of the MOF films are found to be well matched for sensitizing TiO2, and the photoluminescence quenching experiment demonstrates a facile photoelectron transfer path from the doped frameworks to TiO2. Consequently, the doped MOFs are employed successfully as a light harvesting and charge transporting active layer in a fully devised TiO2based solar cell. Two different organic ligands viz., benzene dicarboxylic acid, and naphthalenedicarboxylic acid are used to synthesize two kinds of Co-MOFs having different geometrical dimensions of unit cells and pores, and their influence on hole doping and charge transportation are studied. Under an optimized condition, the Co-MOF based device demonstrates the solar-to-electric energy conversion efficiency of 1.12 % with short circuit current of 2.56 mA.cm -2 , showing a promissing future prosprect on application of Co-MOFs in photovoltaics. Further, the photovoltaic performance of the Co-MOF based divice is comaparatively studied with the previously reported Cu-MOF and Ru-MOF based similar devices, and the influence of different metal centers to MOFs on their light harvesting performce is discussed.