A universal close-space annealing strategy towards high-quality perovskite absorbers enabling efficient all-perovskite tandem solar cells

Abstract

A universal close-space annealing strategy towards high-quality perovskite absorbers enabling efficient all-perovskite tandem solar cells. Nature Energy.

High‐Performance Flexible All‐Perovskite Tandem Solar Cells with Reduced VOC‐Deficit in Wide‐Bandgap Subcell

“…[8] The large V OC -deficit (defined as E g /q-V OC ) in WBG PSCs is commonly attributed to the relatively low initial radiative efficiency of the cells due to the high defect densities within the perovskite absorber layer and at the perovskite/charge selective layer interface. Over the past years, many approaches, including compositional engineering, [9][10][11][12] additive engineering, [13][14][15] interfacial engineering, [16][17][18] and mixed-dimensional engineering, [19][20][21][22] have been explored and the V OC -deficit has been reduced to values as low as 0.37 V in PSCs with bandgap (≈1.72 eV) suitable for perovskite-Si tandems. [23] However, extending these strategies to mitigate the V OC -deficit in perovskites with even wider bandgaps (≈1.80 eV) that are required for two-terminal (2T) all-perovskite tandems remains very challenging.…”

A Roadmap for Efficient and Stable All-Perovskite Tandem Solar Cells from a Chemistry Perspective

“…Recently, Li and co-workers developed a close-space annealing (CSA) strategy, which involves covering the intermediatephase perovskite with a solvent-permeable film during the annealing process. 32 In comparison with the normal annealing, the CSA method slowed the vertical solvent-escape rate and led to recrystallization of grains and a smooth surface. This approach enabled the fabrication of a Pb−Sn perovskite solar cell (PSC) with a 21.5% PCE.…”

Present status and future prospects for monolithic all-perovskite tandem solar cells

“…More recently, Wang et al [19] focused on the fast crystallization for mixed Pb-Sn perovskites and reported a facile film side down close-space annealing (CSA) process to improve the quality of perovskite absorbers. The CSA strategy improved the performance of both NBG and WBG subcells, leading to the highest PCE of 25.05% for tandem cells.…”