Electron Spin Resonance Investigations on Perovskite Solar Cell Materials Deposited on Glass Substrate
| Autor: | Srinivasa Rao Singamaneni, L. M. Martinez, S. R. J. Hennadige, Edison Castro, Luis Echegoyen, C. L. Saiz |
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| Rok vydání: | 2018 |
| Předmět: |
musculoskeletal diseases
010302 applied physics Materials science Silicon Mechanical Engineering Dangling bond Analytical chemistry chemistry.chemical_element Perovskite solar cell 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention chemistry PEDOT:PSS Mechanics of Materials law Impurity 0103 physical sciences Solar cell General Materials Science 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | MRS Advances. 3:1831-1836 |
| ISSN: | 2059-8521 |
| Popis: | In this article, we report low-temperature electron spin resonance (ESR) investigations carried out on solution processed three-layer inverted solar cell structures: PC61BM/CH3NH3PbI3/PEDOT:PSS/Glass, where PC61BM and PEDOT:PSS act as electron and hole transport layers, respectively. ESR measurements were conducted on ex-situ light (1 Sun) illuminated samples. We find two distinct ESR spectra. First ESR spectra resembles a typical powder pattern, associated with gx = gy = 4.2; gz = 9.2, found to be originated from Fe3+ extrinsic impurity located in the glass substrate. Second ESR spectra contains a broad (peak-to-peak line width ~ 10 G) and intense ESR signal appearing at g = 2.008; and a weak, partly overlapped, but much narrower (peak-to-peak line width ~ 4 G) ESR signal at g = 2.0022. Both sets of ESR spectra degrade in intensity upon light illumination. The latter two signals were found to stem from light-induced silicon dangling bonds and oxygen vacancies, respectively. Our controlled measurements confirm that these centers were generated during UV-ozone treatment of the glass substrate –a necessary step to be performed before PEDOT:PSS is spin coated. This work forms a significant step in understanding the light-induced- as well as extrinsic defects in perovskite solar cell materials. |
| Databáze: | OpenAIRE |
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