Effect of the doping of PC61BM electron transport layer with carbon nanodots on the performance of inverted planar MAPbI3 perovskite solar cells
| Autor: | Jianjun Tian, Michal Bodík, Zoran Marković, Matej Jergel, Eva Majkova, Peter Nadazdy, Vojtech Nadazdy, Peter Siffalovic, Yuriy Halahovets, Diego Di Girolamo, Mário Kotlár, Bo Li, Riyas Subair, Juraj Chlpík, Monika Benkovičová, Francesca Brunetti |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Passivation Band gap 020209 energy Inverted planar perovskite solar cell Electron transport layer doping Carbon nanodots Interface engineering Stability improvement Energy-resolved impedance spectroscopy Settore ING-INF/01 02 engineering and technology 7. Clean energy PEDOT:PSS 0202 electrical engineering electronic engineering information engineering General Materials Science Perovskite (structure) Renewable Energy Sustainability and the Environment business.industry Energy conversion efficiency Doping 021001 nanoscience & nanotechnology Dielectric spectroscopy 13. Climate action Optoelectronics 0210 nano-technology business Layer (electronics) |
| Zdroj: | Solar Energy |
| Popis: | The doping effect of carbon nanodots (CNDs) in the PC61BM electron-transport layer on the performance of inverted planar MAPbI3 perovskite solar cells (PSCs) having two different kinds of the hole-transport layer, namely organic PEDOT:PSS and inorganic NiOx, was investigated. The CH3NH3PbI3 perovskite layer was deposited in air at 35% humidity. An average 11% and 12% enhancement of the power conversion efficiency (PCE) was achieved for 1 wt% CNDs doping in the PSCs with PEDOT:PSS and NiOx, respectively. This improvement is attributed to high electron density of CNDs resulting in a triple increase of the electrical conductivity of the PC61BM layer and passivation of the perovskite/PC61BM interface that is reflected by an increase of the open-circuit voltage. In line with this, parallel resistance and fill factor of the PSCs are also improved. Moreover, the energy-resolved electrochemical impedance spectroscopy revealed additional free-charge carriers in the PC61BM layer generated under illumination that were detected via the polaron states formation in the band gap with positive effect on the short-circuit current. All these factors contribute to the PCE improvement. Stability tests of the PSC with PEDOT:PSS under a continuous 24 hour 1.5 AM illumination showed a five times smaller final PCE decrease for the 1 wt% CNDs doping of the PC61BM layer comparing to the undoped counterpart. The passivation effect of CNDs, namely electron filling the traps formed by the photo-dimerization and photo-oxidation of PC61BM molecules, is responsible for this remarkable improvement of the short-term stability. © 2019 International Solar Energy Society |
| Databáze: | OpenAIRE |
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