Measuring the exciton diffusion length of C60 in organic planar heterojunction solar cells

✍ Scribed by Qin, Dashan ;Gu, Peng ;Dhar, Rudra Sankar ;Razavipour, Seyed Ghasem ;Ban, Dayan

• Book ID: 105366335
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 390 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201026724

✦ Synopsis

Abstract

Planar copper phthalocyanine (CuPc)/C~60~ heterojunction solar cells with a 2 nm layer of bathocuproine (BCP) inserted into the C~60~ layer were fabricated and characterized. The 2 nm BCP layer in the devices was used as an electronically selective sieve allowing the electron current through but blocking the excitons in the C~60~ layer. By combining the experimental results with the optical modeling, the effective triplet exciton diffusion length in C~60~ was confirmed to be 30–35 nm under the device working condition. We demonstrate a simple, useful method to determine the exciton diffusion lengths of organic electron acceptors.