An up to 25% power conversion efficiency and performance improvement of perovskite solar cells (PSCs) have made them promising products in photovoltaic technology. This study numerically investigates the light trapping and broadband light absorption enhancement of a PSC by introducing bismuth selenide (Bi2Se3) as shell material for Cu nanospheres (NSs) to achieve a “core/shell” configuration (Cu/Bi2Se3NSs) in the absorber layer of the PSC. The optimal values of Cu NS radius, Bi2Se3 thickness, periodicity of NSs, and the thickness of the absorber layer of PSC are equal to 40, 35, 172.5, and 410 nm, respectively. This structure has a photocurrent density (JL) of 33.01 mA cm−2 and a maximum normalized absorbed power () of 0.89 compared to the bare PSC with = 21.8 mA cm−2 and = 0.87. The results indicate that the increase in the Bi2Se3 thickness up to 35 nm at a fixed Cu NS radius of 40 nm can enhance the absorption in the whole spectrum. However, this enhancement is greater at longer wavelengths. The extinction cross‐section is improved by about 3.5 times in comparison with the bare Cu NSs. The results for the PSC with Cu/Bi2Se3 NSs show a 51.3% absorption enhancement compared to the PSC without NSs.
The improvement of light trapping inside the active layer of perovskite solar cells (PSCs) was numerically investigated. The light absorption probability was improved by incorporating periodic arrays of mesoscopic electron‐transporting layer into the absorber layer (CH3NH3PbI3) of the PSCs. Accordingly, chalcopyrite (CuInSe2) and bismuth selenide (Bi2Se3) were introduced in the form of hexagonal pillars with an optimum radius of 35 nm and a height of 292 nm. It was found that the proposed PSCs can significantly extend the broadband light absorption from the visible spectrum to the near‐infrared (NIR) region compared to planar PSCs that have an identical active layer thickness. After optimization, the PSCs based on MP‐CuInSe2 and MP‐Bi2Se3 showed the best performance with an enhancement of respectively 32% and 54 % in the photocurrent density, (with values of 29.94 and 34.93 mA.cm−2), as compared to the planar PSC (with a photocurrent density of 22.69 mA.cm−2). This enhancement resulted from a more effective carrier transport due to the mesoscopic structures.
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