The Influence of Physical Properties of ZnO Films on the Efficiency of Planar ZnO/Perovskite/P3HT Solar Cell

Abstract

ZnO thin films prepared by pulsed laser deposition at low temperature are utilized as the electron transport layer in CH3NH3PbI3−xClx‐based perovskite solar cells with a planar heterojunction structure. Oxygen pressure greatly influences the transparent and conductive properties of ZnO films, which are extremely important as electron transport layer for the perovskite solar cells. The transparent and conductive properties of the films under different oxygen pressures are studied by ultraviolet‐visible spectrophotometer and Hall effect measurement system. Through controlling the oxygen pressure, transparent ZnO films with high conductivity are grown and adopted as electron transport layer for planar perovskite solar cell with a power conversion efficiency of 6.3%. After further surface modification of ZnO electron transport layer with [6,6]‐phenyl‐C61‐butyric acid methyl ester, the efficiency of the planar solar cell increases to 7.5%.

Large-area perovskite solar cells – a review of recent progress and issues

“…3 Meanwhile, other HTL materials have been used to achieve over 10% efficiencies (e.g. PTAA, 29,66,68 P3HT, [69][70][71] PEDOT:PSS, 60,61,72 CuSCN, 73,74 triazine-Th-OMeTPA, 75 PVCz-OMeDAD, 76 OMeTPA-BDT, 77 NiO x , 56,64,78,79 CuGaO 2 , 54 X26, 80 X36, 80 NiMgLiO 41 etc.). Carbon materials, [81][82][83][84][85] aluminum, 34,56,61,62 silver, 64,65,86 and gold [87][88][89][90] have been used as electrode.…”

“… 3 Meanwhile, other HTL materials have been used to achieve over 10% efficiencies ( e.g. PTAA, 29,66,68 P3HT, 69–71 PEDOT:PSS, 60,61,72 CuSCN, 73,74 triazine-Th-OMeTPA, 75 PVCz-OMeDAD, 76 OMeTPA-BDT, 77 NiO x , 56,64,78,79 CuGaO 2 , 54 X26, 80 X36, 80 NiMgLiO 41 etc. ).…”

Efficiency of MAPbI3-Based Planar Solar Cell Analyzed by Its Thickness-Dependent Exciton Formation, Morphology, and Crystallinity

“…In contrast, the solution-processible ETL based on ZnO nanoparticles can provide enough conductivity without using a high-temperature sintering process. 13,14 It is now also shown that a ZnO-based ETL may have a favorable conduction band energy level to perovskite-type solids, 15 higher electron mobility, 16 and outstanding optical transparency in the visible spectral range. 17 In addition, planar devices can reduce the absorption path length and make it possible for photo-excitation to take place deep into the material, while the mesoporous devices generate most charge carriers relatively close to the junction under strong light-scattering conditions.…”

Carbon‐Based Printable Perovskite Solar Cells with a Mesoporous TiO2 Electron Transporting Layer Derived from Metal–Organic Framework NH2‐MIL‐125

“…[ 43 ] It can be seen that N‐M‐TiO 2 and M‐TiO 2 exhibit similar UV light absorption range of 190–400 nm, which contributes to the light stability of perovskite in PSCs. [ 44 ] Different crystalline phases with different Fermi energy levels possibly change the WF of TiO 2 . [ 45 ] To study this, the WFs of N‐M‐TiO 2 and M‐TiO 2 films were measured in air by using a Kelvin probe (surface scanning: 4.17 × 4.17 mm).…”