The Impact of Grain Alignment of the Electron Transporting Layer on the Performance of Inverted Bulk Heterojunction Solar Cells
El Labban, Abdulrahman
Mohammed, Omar F.
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Catalysis Center (KCC)
Chemical Science Program
MetadataShow full item record
AbstractThis report presents a new strategy for improving solar cell power conversion efficiencies (PCEs) through grain alignment and morphology control of the ZnO electron transport layer (ETL) prepared by radio frequency (RF) magnetron sputtering. The systematic control over the ETL's grain alignment and thickness is shown, by varying the deposition pressure and operating substrate temperature during the deposition. Notably, a high PCE of 6.9%, short circuit current density (Jsc) of 12.8 mA cm-2, open circuit voltage (Voc) of 910 mV, and fill factor of 59% are demonstrated using the poly(benzo[1,2-b:4,5-b']dithiophene-thieno[3,4-c]pyrrole-4,6-dione):[6,6]-phenyl-C71-butyric acid methyl ester polymer blend with ETLs prepared at room temperature exhibiting oriented and aligned rod-like ZnO grains. Increasing the deposition temperature during the ZnO sputtering induces morphological cleavage of the rod-like ZnO grains and therefore reduced conductivity from 7.2 × 10-13 to ≈1.7 × 10-14 S m-1 and PCE from 6.9% to 4.28%. An investigation of the charge carrier dynamics by femtosecond (fs) transient absorption spectroscopy with broadband capability reveals clear evidence of faster carrier recombination for a ZnO layer deposited at higher temperature, which is consistent with the conductivity and device performance. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
CitationMurali B, Labban AE, Eid J, Alarousu E, Shi D, et al. (2015) The Impact of Grain Alignment of the Electron Transporting Layer on the Performance of Inverted Bulk Heterojunction Solar Cells. Small 11: 5272–5279. Available: http://dx.doi.org/10.1002/smll.201500924.
- Enhanced performance in inverted polymer solar cells with D-π-A-type molecular dye incorporated on ZnO buffer layer.
- Authors: Song CE, Ryu KY, Hong SJ, Bathula C, Lee SK, Shin WS, Lee JC, Choi SK, Kim JH, Moon SJ
- Issue date: 2013 Aug
- Electrospun ZnO nanowire plantations in the electron transport layer for high-efficiency inverted organic solar cells.
- Authors: Elumalai NK, Jin TM, Chellappan V, Jose R, Palaniswamy SK, Jayaraman S, Raut HK, Ramakrishna S
- Issue date: 2013 Oct 9
- Low-Temperature Solution-Processed Thiophene-Sulfur-Doped Planar ZnO Nanorods as Electron-Transporting Layers for Enhanced Performance of Organic Solar Cells.
- Authors: Ambade SB, Ambade RB, Bagde SS, Eom SH, Mane RS, Shin WS, Lee SH
- Issue date: 2017 Feb 1
- High-performance inverted tandem polymer solar cells utilizing thieno[3,4-c]pyrrole-4,6-dione copolymer.
- Authors: Yusoff AR, Lee SJ, Kim J, Shneider FK, da Silva WJ, Jang J
- Issue date: 2014 Aug 13
- Morphologic improvement of the PBDTTT-C and PC71BM blend film with mixed solvent for high-performance inverted polymer solar cells.
- Authors: Chen HY, Lin SH, Sun JY, Hsu CH, Lan S, Lin CF
- Issue date: 2013 Dec 6