▎ 摘　　要

NOVELTY - An electron transport layer ink comprises an electron transport material and a solvent. The electron transport material is chosen from C60 fullerene, C70 fullerene, mono-addition fullerene derivative, double-addition fullerene derivative, multi-addition fullerene derivative, graphene, carbon nanotube and/or non-fullerene receptor. The solvent is a non-perovskite soluble solvent. USE - Ink used for preparing electron transport layer of trans-structural perovskite solar cell, perovskite solar cell, perovskite-perovskite laminated solar cell and perovskite-perovskite double-junction laminated battery assembly (all claimed). ADVANTAGE - The ink provides electron transport layer having uniform density, high coverage rate and excellent interface bonding, and is suitable for various roughness perovskite surface. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the ink in the preparation of electron transport layer of trans-structural perovskite solar cell.