Journal
ADVANCED ENERGY MATERIALS
Volume 4, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201301290
Keywords
drift-diffusion; metal oxide; solution processing; molybdenum oxide; organic solar cells; photocurrent dynamics
Categories
Funding
- DoD Defense Threat Reduction Agency [HDTRA1-10-1-0110]
- Department of Energy
- DOE [DE-FG02-08ER46535]
- NSF ConvEne IGERT Program [NSF-DGE 0801627]
- NSF Graduate Research Fellowship
- CSIRO
- Australian Research Council through the APD [DP110105341]
- Australian Solar Institute USASEC research exchange program
- Fulbright Postdoctoral Fellowship Scheme
- MRSEC Program of the NSF [DMR-1121053]
- NSF
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It is demonstrated that a combination of microsecond transient photocurrent measurements and film morphology characterization can be used to identify a charge-carrier blocking layer within polymer:fullerene bulk-heterojunction solar cells. Solution-processed molybdenum oxide (s-MoOx) interlayers are used to control the morphology of the bulk-heterojunction. By selecting either a low- or high-temperature annealing (70 degrees C or 150 degrees C) for the s-MoOx layer, a well-performing device is fabricated with an ideally interconnected, high-efficiency morphology, or a device is fabricated in which the fullerene phase segregates near the hole extracting contact preventing efficient charge extraction. By probing the photocurrent dynamics of these two contrasting model systems as a function of excitation voltage and light intensity, the optoelectronic responses of the solar cells are correlated with the vertical phase composition of the polymer:fullerene active layer, which is known from dynamic secondary-ion mass spectroscopy (DSIMS). Numerical simulations are used to verify and understand the experimental results. The result is a method to detect poor morphologies in operating organic solar cells.
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