Electron transport chain

Quantum mechanics

Materials science

Solubility

Small molecule

Biochemistry

Molecule

Perovskite (structure)

Polymer

Physics

Nanotechnology

Organic chemistry

Perylene

Conjugated system

Composite material

Chemistry

Electron

Organic solar cell

Small

Organic n-type materials (e.g., fullerene derivatives, naphthalene diimides (NDIs), perylene diimides (PDIs), azaacene-based molecules, and n-type conjugated polymers) are demonstrated as promising electron transport layers (ETLs) in inverted perovskite solar cells (p-i-n PSCs), because these materials have several advantages such as easy synthesis and purification, tunable frontier molecular orbitals, decent electron mobility, low cost, good solubility in different organic solvents, and reasonable chemical/thermal stability. Considering these positive factors, approaches toward achieving effective p-i-n PSCs with these organic materials as ETLs are highlighted in this Review. Moreover, organic structures, electron transport properties, working function of electrodes caused by ETLs, and key relevant parameters (PCE and stability) of p-i-n PSCs are presented. Hopefully, this Review will provide fundamental guidance for future development of new organic n-type materials as ETLs for more efficient p-i-n PSCs.

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells