Cuprous Oxide as a Potential Low‐Cost Hole‐Transport Material for Stable Perovskite Solar Cells

Abstract

Inorganic hole‐transport materials are commercially desired to decrease the fabrication cost of perovskite solar cells. Here, Cu2O is introduced as a potential hole‐transport material for stable, low‐cost devices. Considering that Cu2O formation is highly sensitive to the underlying mixture of perovskite precursors and their solvents, we proposed and engineered a technique for reactive magnetron sputtering. The rotational angular deposition of Cu2O yields high surface coverage of the perovskite layer for high rate of charge extraction. Deposition of this Cu2O layer on the pinhole‐free perovskite layer produces devices with power conversion efficiency values of up to 8.93 %. The engineered Cu2O layers showed uniform, compact, and crack‐free surfaces on the perovskite layer without affecting the perovskite structure, which is desired for deposition of the top metal contact and for surface shielding against moisture and mechanical damages.

Enhanced performance of CH3NH3PbI3−x Cl x perovskite solar cells by CH3NH3I modification of TiO2-perovskite layer interface

“…The PL spectra are usually used to explore the trap states and recombination properties of light-excited charge in semiconductors [23, 40–42]. Figure 9 shows the PL spectra of CH 3 NH 3 PbI 3− x Cl x films deposited on bare TiO 2 and modified TiO 2 by CH 3 NH 3 I solutions with different concentrations.…”

“…The CH 3 NH 3 PbI 3− x Cl x film deposited on bare TiO 2 exhibits the highest intensity in PL spectra, corresponding to a higher charge recombination [23]. The CH 3 NH 3 PbI 3− x Cl x film deposited on modified TiO 2 by CH 3 NH 3 I with the concentration of 10 mg/ml shows the lowest peak intensity, indicating the lowest recombination rate [42] and thus the best photovoltaic performance. This is consistent with the results obtained in EIS characterization (Fig.…”

Efficient and Stable Planar n‐i‐p Perovskite Solar Cells with Negligible Hysteresis through Solution‐Processed Cu2O Nanocubes as a Low‐Cost Hole‐Transport Material

“…[9] This has pushed modern research to promote efficacious and low-cost inorganic HTLs such as Cu 2 O. Hossain et al [10] described the primary functiono fP SCs with differentH TM layers such as spiro-MeOTAD, NiO, CuI, CuSCN, and Cu 2 Ob yu sing simulation software. To overcome this issue, Nejand et al [12] reported Organic-inorganic halide perovskite solar cells (PSCs) have reachedc ertified efficiencies of over 23 %w ithe xpensive organic hole-transporting materials. Consequently,t his gives ar eason for the vital research relatedt oi norganic HTMs, especially Cu 2 O, in PSCs.…”

Large-area electrospray-deposited nanocrystalline CuXO hole transport layer for perovskite solar cells

“…Although a high PCE was obtained, the process relies on an organic PEDOT:PSS buffer layer between the CuO layer and the ITO substrate. Nejand 18 and Yu…”