Application of luminescence downshifting materials for enhanced stability of CH3NH3PbI3(1-x)Cl3x perovskite photovoltaic devices

Abstract

The application of luminescent down shifting (LDS) layers as alternative UV filters for CH3NH3PbI3(1-x)Cl3x perovskite solar cell (PSC) devices is reported. A combination of photoabsorption measurements and of device decay measurements during light soaking are used to verify the stability. The application of a UV filter or LDS layer was able to significantly retard photo-induced degradation with ~18% drop in device power conversion efficiency (PCE) observed over 30 hours for non-encapsulated devices, which is compared to ~97% for an unfiltered device, also without encapsulation. Whilst the PCE of the PSC device decreases with the application of the LDS layer, the drop is not as significant as when a commercial UV filter is used. Considering that UV filters will be essential for the commercialization of PSCs, the work provides evidence that the LDS layer can act as an alternative UV filter in PSCs and can limit the drop in PCE that can be expected from the inclusion of a UV filter, thus providing an added benefit over commercial UV filters.

Outdoor performance monitoring of perovskite solar cell mini-modules: Diurnal performance, observance of reversible degradation and variation with climatic performance

“…Numerous studies have addressed instability of perovskite and transport-layers in PSCs induced by heat [3], UV light [4], [5], electric field and humidity [6] and in real outdoor operational conditions many of these factors simultaneously act upon the PSC. However, there are relatively few reports of outdoor performance monitoring of PSCs.…”

Optimum Luminescent Down-Shifting Properties for High Efficiency and Stable Perovskite Solar Cells

“…8,9,16,49 The remaining solar cell dimensions and materials are based on previous results from optimizations centered on maximizing the optical performance of front LT structures on the PSCs, 49 which are summarized in Table S1 of Supplementary Material. A preferential implementation of luminescent down-shifting (LDS) materials is via their embedment in a polymeric matrix used as the cell's encapsulant, 24,25,50 as sketched in Figure 1 a) and b), which is generally several micrometers thick. 24,50 Therefore, such DS encapsulant layer was modelled as the background medium over the cells' structures.…”

“…This is due to the fact that the sum of the optimized and values (resulting in the wavelength to where the shifting occurs) nears 500 nm, which is the spectral position of the peak of the external quantum efficiency of this type of PSCs, as determined in previous contributions. 16,25,26,56 Table 1 -Summary of the main results from the photocurrent density sweeps performed in this work. tPerovskite represents the perovskite thickness, nBackground is the refractive index used for the background medium, pristine Jph is the value using the illumination spectrum without any shifting, optimized Jph is the highest value obtained in the sweeps of Figure 2 and Figure 3, and is the gaussian center and shifting parameter, respectively, corresponding to the maximum photocurrent value obtained in the sweeps.…”

Study on MA(Pb,Cu)Br3 Provskite Nanocrystal with Both Controlled Color Emission and Improved Stability

“…[1][2][3] Due to its excellent optoelectronic properties, such as narrow half peak width, [4] high photoluminescence quantum yield, [5] high carrier mobility and band tenability, [6,7] etc., the organic-inorganic hybrid perovskite quantum dots have been widely studied in the field of solar cell, display and laser. [8][9][10] As the main ingredient in perovskite quantum dots, the toxicity of Pb 2+ seriously limits the practical application of perovskite in the field of optoelectronics. [11][12][13] Therefore, replacing Pb 2+ with non-toxic metal ions is an important measure to reduce the toxicity of perovskite quantum dots, and the Cu 2+ is selected as alternative metal cations to develop a new luminescent material in this paper.…”