Designing ternary blend bulk heterojunction solar cells with reduced carrier recombination and a fill factor of 77%
| Autor: | Thomas Heumueller, Christoph J. Brabec, Gebhard J. Matt, Nicola Gasparini, Xuechen Jiao, Tayebeh Ameri, Derya Baran, Erdmann Spiecker, Harald Ade, Stefanie Fladischer |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Organic solar cell Renewable Energy Sustainability and the Environment business.industry food and beverages Energy Engineering and Power Technology 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Solar irradiance 01 natural sciences Effective nuclear charge Polymer solar cell 0104 chemical sciences Electronic Optical and Magnetic Materials Organic semiconductor Fuel Technology chemistry Optoelectronics 0210 nano-technology business Ternary operation Recombination |
| Zdroj: | Nature Energy. 1 |
| ISSN: | 2058-7546 |
| Popis: | In recent years the concept of ternary blend bulk heterojunction (BHJ) solar cells based on organic semiconductors has been widely used to achieve a better match to the solar irradiance spectrum, and power conversion efficiencies beyond 10% have been reported. However, the fill factor of organic solar cells is still limited by the competition between recombination and extraction of free charges. Here, we design advanced material composites leading to a high fill factor of 77% in ternary blends, thus demonstrating how the recombination thresholds can be overcome. Extending beyond the typical sensitization concept, we add a highly ordered polymer that, in addition to enhanced absorption, overcomes limits predicted by classical recombination models. An effective charge transfer from the disordered host system onto the highly ordered sensitizer effectively avoids traps of the host matrix and features an almost ideal recombination behaviour. Carrier recombination in organic solar cells usually limits their optoelectronic performance, in particular their fill factor. Gasparini et al show that adding an ordered polymer to a ternary blend reduces carrier recombination, achieving a fill factor of 77%. |
| Databáze: | OpenAIRE |
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