Self -assembled Monolaag increases the performance of lead -free perovskiet solar cells
Perovskiet -and half -guides offer promising potential for solar energy because of their thin, flexible structure, high efficiency and low production costs. However, widespread commercialization is limited by two critical factors: long -term stability and the presence of toxic lead with good performing variants.
Researchers at Helmholtz-Zentrum Berlin (HZB) investigate TIN-based perovskiet solar cells as a safer, more stable alternative. These lead-free cells show unique electro-optical properties that are ideal for tandem and triple junction solar cells, although their efficiency is still lagging behind in leading counterparts.
A considerable bottleneck is in the cargo transport layer. Conventional solar cells from Tin Perovskiet rely on pedot: PSS for the lowest contact layer, a material that introduces inefficiencies and adds complexity to manufacture. While self-assembled Monolagen (SAM’s) have established new efficiency records in lead-based perovskites, their application in tin variants has understood so far.
Main researcher Dr. Artem Musiienko and employees identified the problem with the help of the functional theory of the density, which showed a poor interface lines between the Meo-2Pacz Sam and the Tin Perovskiet schaster. This mismatch led to significant recombination losses.
To tackle this, the team investigated alternative SAMs and identified the Fenothiazine-based TH-2ept, synthesized by researchers at Kaunas University of Technology in Lithuania. This sulfur-Functionalized molecule forms Tin Perovskiet films with good crystallinity and a more favorable interface, reducing electronic losses.
Solar cells that Th-2ept used, better than those of Pedot or Meo-2Pacz, which achieves an efficiency of 8.2%. “We have shown that the performance of photovoltaic with tin perovskiet can be considerably improved by targeted and rational molecular design,” Dr. Musiienko. Co-author Valerio Stacchini added: “We prove that the higher performance arises from the excellent opto-electronic quality of perovskiet that is grown on the novel Sam.”
Research report:Fenothiazine-based self-assembled monolaag with thiophene head groups minimizes buried interface losses in solarper senior soles of solar cells
