In perovskite solar cells, thermal degradation is an obstacle to commercialization. The mechanism of structural change and chemical change caused by heat was revealed by in situ measurement of transmission electron microscope.
Article: In situ Observation of Thermal Degradation of Perovskite Solar Cell
In situ observation of heat-induced degradation of perovskite solar cells
doi: 10.1038 / nenergy.2015.12
Altmetric: 2 Views: 859 Citations: 1 More detail
Article
In situ observation of heat-induced degradation of perovskite solar cells
G. Divitini, S. Cacovich, F. Matteocci, L. Cinà, A. Di Carlo & C. Ducati
Nature Energy 1, Article number: 15012 (2016)
doi: 10.1038 / nenergy.2015.12
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Characterization and analytical techniques | Solar cells | Solar energy and photovoltaic technology
Received:
25 August 2015
Accepted:
18 November 2015
Published online:
18 January 2016
http://www.nature.com/articles/nenergy201512?WT.mc_id=SFB_Nenergy-201602_JAPAN_PORTFOLIO
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Research on perovskite solar cells has been actively conducted in recent years.
Its energy conversion efficiency (PCE) exceeds 15%. Furthermore, the device can be made by solution coating and it has the advantage that it can be manufactured at low cost.
The important role of this solar cell is organic-inorganic hybrid type perovskite compound (MeNH 3 PbI 3) of semiconductor material used as light absorption layer.
By using high purity lead iodide (II) as a raw material for perovskite compound, it becomes possible to create excellent solar cell devices.
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When I read the abstract of the paper mentioned above,I was surprised.
On observation the Perovskite thin film With a transmission electron microscope, with heating it in situ, the movement of chemical components and the resulting physical structural change by heat was cleared.
It is said that it was found to be the cause of deterioration.
In particular, as a chemical component,
Migration of lead and iodine is a problem.
Since lead has a low melting point and is easy to volatilize, it is natural that components will move or volatilize if heated.
I was slightly surprised that iodine has properties similar to that.
Why investigate thermal stability in the first place?
Because The thin film of PbI perovskite type will be useful for solar cell.
But it's Heat stability improvement must be desired.
The PbI perovskite was a crystal that hardens almost without heating, it actually require heating in the formation process.
By rising heat while receiving commercial sunlight, they may degrade.
Even though instantaneous efficiency is good,The future is low.
I say, now
Similarly for bismuth-based ferroelectrics thin films, migration of bismuth occurs,
It is reported that the structure formed by this is different and the performance changes.(JJAP 1998)
This time, the migration of lead and iodine is also heated,
It is expected that migration in the membrane and volatilization into the air occur.
Particularly, lead is volatilized in the air is not good for the environment and it is not good in terms of performance.
For Developing lead-free perovskite type solar cells,
If thermal stability is not realized,
Practicality as a solar cell is low.
Heat stability improvement is desired.
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