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Exploration of donor effect on electron injection and photovoltaic properties of chalcone derivatives

Irfan A.

Materials Science Poland

2018

Vol. 36, No. 2

276--282

Various photovoltaic parameters, i.e., electron injection (ΔGinject.), electronic coupling constants (|VRP|), light harvesting efficiencies (LHE), band alignment and electronic properties of five chalcone derivatives were studied by density functional theory (DFT) and time domain. The light was also shed on the effect of different electron donating groups and their strength intensity on the electronic and charge transfer properties. The balanced hole and electron reorganization energies for Comp 4 showed that it might have better ambipolar charge transfer in nature. The strong electron donating group(s) usually enhance(s) the ΔGinject. and |VRP| of chalcones as -N(CH3)2 > OCH3 > OH. Additionally, ΔGinject. and |VRP| of various substituted chalcone derivatives have been observed as trimethoxy > dimethoxy > monomethoxy. The greater electron donating ability of substituents is also favorable for the staggered band alignment. The superior ΔGinject. of all the studied chalcones than of the referenced compounds disclosed that the prior compounds would be proficient photovoltaic materials.

Synthesis, characterization and photovoltaic properties of Mn-doped Sb2S3 thin film

Horoz S., Sahin O.

Materials Science Poland

2017

Vol. 35, No. 4

861--867

Synthesis and characterization of Mn-doped Sb2S3 thin films (TFs) prepared by chemical bath deposition (CBD) at room temperature have been documented and their structural, optical, morphological, magnetic and photovoltaic properties have been examined for the first time. Their structural properties reveal that the Mn-doped Sb2S3 TF has an orthorhombic phase structure of Sb2S3, and that the grain size of the Mn-doped Sb2S3 TF (72.9 nm) becomes larger than that of undoped Sb2S3 TF (69.3 nm). It has been observed that Mn content causes the Sb2S3 TF band gap to decrease. This situation clearly correlates with band tailing due to the impurities that are involved. The morphological properties have revealed that the shape of the Mn-doped Sb2S3 TF is more uniform than the shape of its undoped counterpart. The study on its magnetic properties has demonstrated that the Mn-doped Sb2S3 TF exhibits paramagnetic behavior. Its paramagnetic Curie-Weiss temperature was found to be -4.1 K. This result suggests that there is an anti-ferromagnetic interaction between Mn moments in the Mn-doped Sb2S3 TF. Incident photon to electron conversion efficiency (IPCE) and J-V measurements were also carried out for the Mn-doped Sb2S3 TF for the first time. The results have indicated that the Mn-doped Sb2S3 TF can be utilized as a sensitizer to improve the performance of solar cells. Another important observation on the photovoltaic properties of Mn-doped Sb2S3 TF is that the spectral response range is wider than that of undoped Sb2S3 TF. Our study suggests that the introduction of dopant could serve as an effective means of improving the device performance of solar cells.