Scientists expose defect homes in photovoltaic material

• As a new member of photovoltaic family, antimony trisulfide (Sb2S3) has the satisfactory bandgap of 1.7 eV, profiting the fabrication of the leading absorber layer of tandem solar cells. Because of an unique quasi-one-dimensional framework, it shows benefits of much less dangling bonds. Based upon these advantages, the openings defects upon the surface triggering the recombination of carriers could be minimized dramatically, which assists to resolve the photovoltaic problems in solar cells.

In previous studies, the connections between conformation, chemical composition as well as framework of deep-level defects on Sb2S3 films are uncertain.

In a research study released in Nature Communications, a study group led by Chen Tao from University of Scientific Research and also Technology of China (USTC) of the Chinese Academy of Sciences found the one-of-a-kind flaw residential or commercial properties of low-dimensional materials specifically Sb2S3 through building the bridge in between the deep-level flaws of Sb2S3 and also anion/cation ratio.

The researchers prepared both Sb-rich and also sulfur-rich Sb2S3 films by utilizing the approach of thermal dissipation deposition. Based on the exceptional efficiency of the gadgets, the deep-level transient spectroscopy (DLTS) was put on detect the characterizations of flaws.

The sulfur-rich Sb2S3 films revealed an outstanding efficiency compared with Sb-rich Sb2S3 films as the lower density of flaw and less destructive to carrier transportation were achieved, which matches with the renovation in photovoltaic performance. Based upon theoretical computations, it seems that the issues are fad to appear in Sb-rich Sb2S3 films.

Significantly, the sulfur-rich Sb2S3 devices produced by thermal dissipation showed the greatest document power conversion efficiency, which implies that the product can being extra tolerant to openings problems, as well as indicates that the addicting introduce to the job will not decrease the lifetime of carriers.

This research study supplies a new remedy to control the photovoltaic residential properties of Sb2S3.