Phenomenological morphology design of hybrid organic-inorganic perovskite solar cell for high efficiency and less hysteresis

In this report, a modeling approach is employed to study the effect of the grain boundaries (GBs) and their electronic activity on the performance parameters of the perovskite solar cells (PSCs). Our model is based on the 1- dimensional drift-diffusion framework to engage the electron (hole) defects...

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Veröffentlicht in:Solar energy materials and solar cells 2020-02, Vol.205, p.110251, Article 110251
Hauptverfasser: Ameri, Mohsen, Ghaffarkani, Mashhood, Ghahrizjani, Reza Taheri, Safari, Nasser, Mohajerani, Ezeddin
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Sprache:eng
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Zusammenfassung:In this report, a modeling approach is employed to study the effect of the grain boundaries (GBs) and their electronic activity on the performance parameters of the perovskite solar cells (PSCs). Our model is based on the 1- dimensional drift-diffusion framework to engage the electron (hole) defects formed in the GBs and the GB's location through the perovskite layer. Power conversion efficiency (PCE) of the PSC is optimized with regards to the perovskite layer thickness, GBs location and perovskite layer band offset with GBs layer. The results shows that the location or the distribution of the GBs can vary the PCE of PSCs from 12% to around 21%, thereby making proper morphology engineering and passivation of GBs is a chief requirement for achieving high efficiency. PCEs larger than 21% require GB defect densities below 1015cm−2. It is demonstrated that the band offset of about 100 meV with GB width of 1 nm could effectively suppress the negative impact of the GBs throughout the entire perovskite layer. Interestingly, GBs location at closer points to electron transport layer (ETL)/perovskite interface may give rise to higher PCEs, however, relatively stronger hysteresis in current values is observed. The results here provide insight into the effect of the GBs location and their corresponding type of defects on the hysteresis and the PSC performance and opens up new horizons to find solutions for current PSC's shortcomings. We investigate the relevance of grain boundaries location and their electronic activity for optimizing the performance and minimizing the J-V Hysteresis in PSCs. [Display omitted] •Studying the grain boundaries (GBs) electronic activity in PSCs.•GBs located at closer points to ETL/perovskite interface result in higher PCE.•Hysteresis is weakened when the GBs are closer to HTL/perovskite interface.•Efficiencies larger than 21% require GB defect densities below 1015cm−2.•Band offset of 100 meV with GB width of 1 nm may suppress the impact of the GBs.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2019.110251