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

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 15; no. 27; pp. e1900854 - n/a
• Main Authors: Said, Ahmed Ali, Xie, Jian, Zhang, Qichun
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01-07-2019
• Subjects: Chemical synthesis; Electron mobility; Electron transport; electron transport materials; Fullerenes; inverted perovskite solar cells; modified fullerene materials; Molecular orbitals; Nanotechnology; Naphthalene; n‐type polymers; Organic chemistry; Organic materials; organic n‐type small molecules; Perovskites; Photovoltaic cells; Solar cells; Thermal stability; Transport properties; n-type polymers; modified fullerene materials; electron transport materials; organic n-type small molecules; inverted perovskite solar cells
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201900854

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.
Organic n‐type materials as electron transport layers (ETLs) in inverted perovskite solar cells (p–i–n PSCs) have attracted many scientists' attention, not only because of their several advantages, including easy synthesis, tunable frontier molecular orbitals, decent electron mobility, and reasonable chemical/thermal stability, but also because of their ability to make large‐scale solution‐processing p–i–n PSCs possible.