Effects of Bismuth Incorporation in CsPbI3 on All Inorganic Perovskite Solar Cells Performances
Merabet Boualem a
a University of Mascara, Mascara, Oran, 29000, Algeria
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Perovskite Thin Film Photovoltaics (ABXPV18). 27-28 Feb
Rennes, France, 2018 February 27th - March 1st
Organizer: Jacky Even
Poster, Merabet Boualem, 054
Publication date: 11th December 2017

Doping enables manipulating both optical/electrical properties of semiconductors-keys to device functionality, so as defects interacting with incident light via electrons or holes can strongly affect solid optics. Although monovalent Cs+ cations of all-inorganic CsPbI3 used as dopants in methyl-ammonium (MA) organo-lead tri-iodide hybrid perovskites (OLHPs) so-called (MAPbI3) at MA+ sites increase thermal stability and broaden absorption range of such OLHPs based solar cells (Scs), established heterovalent doping in these could switch the majority charge carrier sign from n to p-type and vice versa, and allow inventing devices based on a p-n OLHP homojunction with minimal lattice mismatch. In terms of doping, replacing Pb+2 by Sn+2 to render OLHP absorbers less or even non toxic was inefficient due to Sn-OLHP metallicity. Sn-based OLHPs compared to their Pb-based counterparts show inferior device performances exhibiting more sensitive to degradation due to self oxidation. To limit concerns with the Pb toxicity and negative Sn2+ doping effect developing alternative of low temperature processed OLHP-Scs doped with suitable species is somehow necessary. Owing to the correlated electronic, thermoelectric, spintronic and optoelectronic behaviors that bismuth (Bi)-based materials exhibit, these have attracted significant research interest. Typical Bi-based materials luminescence characteristics include broad absorption bands and tunable emission in the visible range with high quantum efficiencies, promising a great potential for a plethora of applications, not the least biomedicine, displays, and lasers. Due to the possibility of replacing alkali metal ions by Bi ions (whose oxidation state from near-IR PL measurements is found to be +3) in CsPbI3, structural defects are induced by Bi doping. Through studying components and composition ratios, Choi et al. synthesized cesium (Cs)-doping in MA lead iodide perovskites (CsxMA1-xPbI3) light absorbers to improve device performance by optimizing optical and electronic properties of such OLHP materials, and reported high performances was achieved via 10% Cs doping in MAPbI3 structure. For example, Bi3+ doping at Pb2+ sites in MA-OLHPs (like MAPbBr3) lead to Eg narrowing and carrier concentration increasing in such materials. Here, we intend to study the effects of Bi incorporation in α-CsPbI3 on the performances of such inorganic perovskite based Solar Cells.

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