Dual functional high entropy perovskite La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 interfacial transition layer modified Cu2Y2O5/CdIn2O4 transparent pn junction towards photovoltaic enhancement.

A transparent device in perovskite HEO La(Mn 0.2 Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2)O 3 modified Cu 2 Y 2 O 5 /CdIn 2 O 4 is prepared via a simple approach of sol-gel method. The Cu 2 Y 2 O 5 /La(Mn 0.2 Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2)O 3 /CdIn 2 O 4 exhibits high transparency of ∼85–90 %, obvious photovoltaic conversion efficiency enhancement of ∼2.5 × 103-folds (PCE of ∼1.12 %), and stable output in 5-months. This is mainly attributed to the La(Mn 0.2 Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2)O 3 modification, as well as the appropriate Fermi level and high quantum yield. In this system, the La(Mn 0.2 Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2)O 3 solid solution, with extra carrier injecting/driving from synergism of mixed transition metals charge compensation and lattice distortion, can improve the carrier kinetic equilibrium for PCE-transparency balance. Additionally, it can increase p-type conductivity through the synergism of Cu vacancy/interstitial oxygen. Moreover, the inorganic perovskite HEO La(Mn 0.2 Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2)O 3 with modification stability is beneficial for the actual applications. [ABSTRACT FROM AUTHOR]