Cathode buffer composed of fullerene–ethylenediamine adduct for an organic solar cell
| Autor: | Yoshinori Kimoto, Katsuhiko Fujita, Tsuyoshi Akiyama |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Physics and Astronomy (miscellaneous) Organic solar cell Chemistry Energy conversion efficiency General Engineering Analytical chemistry General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Polymer solar cell Cathode Buffer (optical fiber) law.invention Active layer Saturation current law 0103 physical sciences Vacuum level 0210 nano-technology |
| Zdroj: | Japanese Journal of Applied Physics. 56:021601 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.7567/jjap.56.021601 |
| Popis: | We developed a fullerene–ethylenediamine adduct (C60P-DC) for a cathode buffer material in organic bulk heterojunction solar cells, which enhance the open-circuit voltage (V oc). The evaporative spray deposition using ultra dilute solution (ESDUS) technique was employed to deposit the buffer layer onto the organic active layer to avoid damage during the deposition. By the insertion of a C60P-DC buffer layer, V oc and power conversion efficiency (PCE) were increased from 0.41 to 0.57 V and from 1.65 to 2.10%, respectively. The electron-only device with the C60P-DC buffer showed a much lower current level than that without the buffer, indicating that the V oc increase is caused not by vacuum level shift but by hole blocking. The curve fitting of current density–voltage (J–V) characteristics to the equivalent circuit with a single diode indicated that the decrease in reversed saturation current by hole blocking increased caused the V oc. |
| Databáze: | OpenAIRE |
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