Highly stable and efficient inverted organic solar cells based on low-temperature solution-processed PEIE and ZnO bilayers. Issue 10 (15th February 2016)

• Record Type: Journal Article
• Authors: Jin, Won-Yong; Ginting, Riski Titian; Jin, Sung-Ho; Kang, Jae-Wook
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 10(2016)
• Page Start: 3784
• Page End: 3791
• Publication Date: 2016-02-15
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta00957c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Highly efficient and air-stable inverted organic solar cells were fabricated from solution-processed non-conjugated polyethylenimine ethoxylated as the polyelectrolyte, a zinc oxide bilayer as the electron transport layer, and an active layer of PTB7 and PC71 BM. Abstract : Highly efficient and air-stable inverted organic solar cells (IOSCs) were fabricated from solution-processed non-conjugated polyethylenimine ethoxylated (PEIE) as the polyelectrolyte, a zinc oxide (ZnO) bilayer as the electron transport layer, and an active layer of thieno[3, 4- b ]thiophene/benzodithiophene (PTB7) and [6, 6]-phenyl-C71 -butyric acid methyl ester (PC71 BM). When compared to conventional ZnO thin film devices, the incorporation of ZnO with nano-ridge structures (ZnO-R) and large interfacial areas, in addition to low leakage currents, led to an enhancement in power conversion efficiency from 7.41% to 8.38%. Furthermore, the presence of a thin PEIE layer between ITO and ZnO-R not only suppressed the formation of an oxygen deficient state at the ZnO-R surface, but also improved charge carrier mobilities and prevented leakage currents. Consequently, a maximum (average) efficiency of 8.91% (8.86%) and superior air stability with approximately 65% of the initial efficiency being retained after 326 days of storage under ambient atmosphere were achieved.