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Photoinduced Bulk Polarization and Its Effects on Photovoltaic Actions in Perovskite Solar Cells.
ACS Nano
November 2017
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
This article reports an experimental demonstration of photoinduced bulk polarization in hysteresis-free methylammonium (MA) lead-halide perovskite solar cells [ITO/PEDOT:PSS/perovskite/PCBM/PEI/Ag]. An anomalous capacitance-voltage (CV) signal is observed as a broad "shoulder" in the depletion region from -0.5 to +0.
View Article and Find Full Text PDFX-Ray Nanoscopy of a Bulk Heterojunction.
PLoS One
August 2017
Department of Physics, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway.
Optimizing the morphology of bulk heterojunctions is known to significantly improve the photovoltaic performance of organic solar cells, but available quantitative imaging techniques are few and have severe limitations. We demonstrate X-ray ptychographic coherent diffractive imaging applied to all-organic blends. Specifically, the phase-separated morphology in bulk heterojunction photoactive layers for organic solar cells, prepared from a 50:50 blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) and thermally treated for different annealing times is imaged to high resolution.
View Article and Find Full Text PDFSynergistic doping of fullerene electron transport layer and colloidal quantum dot solids enhances solar cell performance.
Adv Mater
February 2015
Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
The spatial location of the predominant source of performance-limiting recombination in today's best colloidal quantum dot (CQD) cells is identified, pinpointing the TiO2:CQD junction; then, a highly n-doped PCBM layer is introduced at the CQD:TiO2 heterointerface. An n-doped PCBM layer is essential to maintain the depletion region and allow for efficient current extraction, thereby producing a record 8.9% in overall power conversion efficiency.
View Article and Find Full Text PDFElectrode materials, thermal annealing sequences, and lateral/vertical phase separation of polymer solar cells from multiscale molecular simulations.
ACS Appl Mater Interfaces
December 2014
Research Center for Applied Sciences, Academia Sinica , 128 Sec. 2 Academia Road, Taipei 11529, Taiwan.
The nanomorphologies of the bulk heterojunction (BHJ) layer of polymer solar cells are extremely sensitive to the electrode materials and thermal annealing conditions. In this work, the correlations of electrode materials, thermal annealing sequences, and resultant BHJ nanomorphological details of P3HT:PCBM BHJ polymer solar cell are studied by a series of large-scale, coarse-grained (CG) molecular simulations of system comprised of PEDOT:PSS/P3HT:PCBM/Al layers. Simulations are performed for various configurations of electrode materials as well as processing temperature.
View Article and Find Full Text PDFVisualization of phase evolution in model organic photovoltaic structures via energy-filtered transmission electron microscopy.
ACS Nano
September 2013
National Institute of Standards and Technology, Material Measurement Laboratory, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States.
The morphology of the active layer in an organic photovoltaic bulk-heterojunction device is controlled by the extent and nature of phase separation during processing. We have studied the effects of fullerene crystallinity during heat treatment in model structures consisting of a layer of poly(3-hexylthiophene) (P3HT) sandwiched between two layers of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Utilizing a combination of focused ion-beam milling and energy-filtered transmission electron microscopy, we monitored the local changes in phase distribution as a function of annealing time at 140 °C.
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