Design and defect study of Cs₂AgBiBr₆ double perovskite solar cell using suitable charge transport layers

Abstract

In this work, perovskite solar cells (PSCs) based on Cs2AgBiBr6 with various electron transport layers and hole transport layers were modeled and analyzed. The device structure is FTO/ZnO/Cs2AgBiBr6/NiO/Au. PCE is practically saturated after the perovskite thickness of 700 nm. PCE declines from 21.88 % to 1.58 % when carrier lifetime decreases from 103 ns to 10−1 ns. Deep level defects at mid-band gap energy of the perovskite layer can trap both carriers, allowing greater carrier recombination. Carrier capture cross-sectional area greatly impacts on cell performance. When subjected to high temperatures (T), the carrier mobility would diminish because carrier scattering increases the cell resistance. That’s why raising T from 300 K to 400 K, the value of built-in potential (Vbi) decreases from 1.17 V to 0.98 V. Device shows maximum efficiency when FTO is used as the front electrode, and Au is used as a back electrode. The optimum device, made of ITO/ZnO/Cs2AgBiBr6/NiO/Au, provides Voc = 1.29 V, Jsc = 20.69 mA/cm2, FF = 81.72 %, and PCE = 21.88 %.

An In‐Depth Investigation of the Combined Optoelectronic and Photovoltaic Properties of Lead‐Free Cs2AgBiBr6 Double Perovskite Solar Cells Using DFT and SCAPS‐1D Frameworks

“…Table 5 represents the assessment results among previously experimental [32,33] and theoretical [34][35][36][37][38] studies on PV parameters of Cs 2 AgBiBr 6 -based PSC. Among the previous studies, Alkhammash et al were able to get the highest 21.88% PCE with the structure of FTO/ZnO/Cs 2 AgBiBr 6 /NiO/Au.…”

“…Table 5 represents the assessment results among previously experimental [ 32,33 ] and theoretical [ 34–38 ] studies on PV parameters of Cs 2 AgBiBr 6 ‐based PSC. Among the previous studies, Alkhammash et al.…”

“…were able to get the highest 21.88% PCE with the structure of FTO/ZnO/Cs 2 AgBiBr 6 /NiO/Au. [ 37 ] While experimental works FTO/TiO 2 /Cs 2 AgBiBr 6 /Spiro‐OMeTAD/Au and FTO/TiO 2 /Cs 2 AgBiBr 6 /Spiro‐OMeTAD/MoO 3 /Ag structures PCE was 1.66% [ 32 ] and 2.51% [ 33 ] respectively, that is not upto the mark. Whereas by combining Ten different HTLs with 4 ETLs, the best efficiency of 23.50% is achieved for the proposed structure of FTO/AZnO/Cs 2 AgBiBr 6 /CNTS/Au in this study which is exceptional.…”

“…combined TiO 2 and Cu 2 O with Cs 2 AgBiBr 6 and got a PCE of 7.25% [ 36 ] while Alkhammash et al used ZnO and NiO to get a PCE of 21.88%. [ 37 ] Chabri et al. and his team investigated Cs 2 AgBiBr 6 and got a PCE of 7.16%.…”

Silver‐Nanoclusters and Vacancies Influence the Optical Properties of Spherical Cs2AgBiCl6 Nanocrystals

“…A minor amount of research work dealt with the role of particular crystal defects that trap the photoexcited carriers and hinder the charge carrier transport in Cs 2 AgBiX 6 DPs. [18][19][20][21][22] Time-resolved microwave conductance measurement on Cs 2 AgBiBr 6 polycrystalline thin film and crystal by Savenije's group, [18] initially pointed out the presence of shallow electron and hole traps in bulk Cs 2 AgBiBr 6 DPs. Soon after, T. Li et al [20] calculated the nature of defects in Cs 2 AgBiX 6 DPs based on density-functional theory.…”