High-performance g-C3N4 added carbon-based perovskite solar cells insulated by Al2O3 layer
| Autor: | Ling Zhang, Zhenyun Zhang, Zonglin Yang, Weili Fan, Junjie Qi, Chao-sheng Hu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry 020209 energy Energy conversion efficiency Graphitic carbon nitride chemistry.chemical_element Perovskite solar cell 02 engineering and technology 021001 nanoscience & nanotechnology Grain size Cathode law.invention Crystal chemistry.chemical_compound chemistry law 0202 electrical engineering electronic engineering information engineering Optoelectronics General Materials Science 0210 nano-technology business Carbon Perovskite (structure) |
| Zdroj: | Solar Energy. 193:859-865 |
| ISSN: | 0038-092X |
| DOI: | 10.1016/j.solener.2019.09.100 |
| Popis: | Carbon-based perovskite solar cell (C-PSC) has attracted extensive attention for its low cost and super stability. However, C-PSCs always suffer from much lower power conversion efficiency (PCE) compared with PSCs with noble metal cathode. Herein, we report an effective method to improve the efficiency of C-PSC by adding graphitic carbon nitride (g-C3N4) into the perovskite. The addition of g-C3N4 significantly improves the crystal quality of the perovskite, which is characterized by its larger grain size, reduced defects and flatter surface coverage. The PCE of C-PSCs was improved from 10.5% to 12.8% because of the enhancement of the crystal quality. Furthermore, to enhance the correspondingly low open-circuit voltage (Voc) caused by a high charge recombination, an insulating layer was developed by spin-coating Al2O3 on the surface of the electron transport material (ETM). It can effectively hinder the recombination of the electrons in ETM layers with holes left in perovskite layers. As a result, an optimized device with a maximum PCE of 14.34% is obtained together with a distinct improvement in voltage from 0.92 V to 1.0 V. This work increases the possibility of the commercialization of high stable C-PSCs. |
| Databáze: | OpenAIRE |
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