Optimizing the NiO_x/Au Interface via Postannealing of the All‐Inorganic CsPbIBr₂ Perovskite Solar Cells for High Efficiency

Abstract

All‐inorganic perovskite solar cells (PSCs) have been demonstrated to solve the thermal instability problem of organic–inorganic hybrid PSCs. Therefore, NiO x film is prepared by electron beam evaporation as a hole transport layer of all inorganic CsPbIBr2 PSCs. Then, the postannealing is used to promote the diffusion of NiO x into the gold electrode, and enhance interface contact and reducing the electrical resistance of NiO x /Au. After optimizing NiO x /Au interface, the devices based on NiO x achieved a power conversion efficiency (PCE) of 6.7%. Furthermore, the best all‐inorganic CsPbIBr2 PSC free of encapsulation retains 95% of initial efficiency over 100 h at 85 °C. Herein, an effective postannealing strategy is provided for optimized NiO x /Au interface to make stable and efficient all‐inorganic CsPbIBr2 PSCs.

Oxide/Halide/Oxide Architecture for High Performance Semi‐Transparent Perovskite Solar Cells

“…As previously reported, additional annealing is required to improve interface contact between NiO x and Au layer due to the poor interface contact. [44] Therefore, we speculate that the higher V oc and FF for ITO are attributed to an improved interface contact.…”

Design of Efficient Inverted NiOX‐Based Three‐Terminal Back‐Contact All Perovskite Tandem Solar Cells

“…From the incident light side, top cell consists of an indium tin oxide (ITO) transparent conductive layer, a NiO X HTL, a CsPbI 2 Br perovskite absorber layer, a tin dioxide (SnO 2 ) electron transport layer (ETL), and an Ag electrode. [32,33] The J-V characteristics of top cell were obtained, see Figure 1c. The top cell with a 450 nm-thick wide bandgap (WBG) CsPbI 2 Br perovskite absorber layer achieved a PCE of 22.87%, while short circuit current density (J SC ) reached 20.31 mA cm −2 , open-circuit voltage (V OC ) stood at 1.35 V, and fill factor (FF) was 83.42%.…”

Bifunctional Lewis Base‐Assisted Fabrication of High‐Quality CsPbIBr2 Perovskite for Efficient and Stable Solar Cells

“…[5,6] Therefore, all inorganic perovskites (CsPbX 3 , X = Br, I, or mixed) with outstanding thermal stability and superior optoelectronic properties have caught widespread attention and have been considered as a promising material for application in PSCs recently. [7][8][9][10][11][12][13][14][15][16] Up to now, the most widely studied inorganic CsPbX 3 perovskites employed in high-performance PSCs mainly involve CsPbI 3 , CsPbI 2 Br, CsPbIBr 2 , and CsPbBr 3 . Among these inorganic perovskites, CsPbI 3 perovskite displays the narrowest bandgap (1.73 eV).…”

“…[ 5,6 ] Therefore, all inorganic perovskites (CsPbX 3 , X = Br, I, or mixed) with outstanding thermal stability and superior optoelectronic properties have caught widespread attention and have been considered as a promising material for application in PSCs recently. [ 7–16 ]…”