Nickel Oxide/Cobalt Phthalocyanine as a Hole Transport Bilayer for Efficient and Stable Inverted Perovskite Solar Cells
Beisembekov M. Aimukhanov A. Tazhibayev S. Abeuov D. Zeinidenov A.
21 August 2025John Wiley and Sons Inc
Small
2025#21Issue 33
This study demonstrates that the use of bilayer films based on nickel oxide (NiOx;) and cobalt phthalocyanine (CoPc) represents a promising hole transport layer (HTLs) for inverted perovskite solar cells (PSCs). NiOx; films are fabricated using the spin-coating method from a sol–gel solution. Films (CoPcevap) and nanowires (CoPcnws) on the NiOx; surface are produced by thermal sputtering and physical gradient-temperature vapor deposition. It is demonstrated that PSCs with a NiOx; layer exhibit a power conversion efficiency (PCE) of only 18,1%. The incorporation of a CoPcevap intermediate layer between NiOx; and the perovskite increases the PCE to 19.1%. The highest PCE, reaching 20.7%, is achieved with a bilayer HTLs based on NiOx;/CoPcnws. Analysis of the PSC impedance spectra shows that the CoPcnws intermediate layer reduces the HTLs resistance and increases the recombination resistance at the perovskite/HTLs interface, which extends the effective lifetime of charge carriers. The stability of NiOx;-based PSCs is 48%, while PSCs with bilayer HTLs based on NiOx;/CoPcnws and NiOx;/CoPcevap exhibits higher stability of 71% and 90% over 600 hours. The results demonstrated that solar cells based on NiOx;/CoPc inhibit the perovskite degradation process and reduce charge recombination, thereby improving the performance and stability of the inverted PSCs.
cobalt phthalocyanine , electrical transport characteristics , hole transport layers , nickel oxide , optical properties , perovskite solar cells
Text of the article Перейти на текст статьи
Scientific Center of nanotechnology and functional nanomaterials, Buketov Karaganda University, University str., 28, Karaganda, 100028, Kazakhstan
Scientific Center of nanotechnology and functional nanomaterials
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026