Trap passivation and efficiency improvement of perovskite solar cells by a guanidinium additive

A photoactive layer with efficient charge transport and low charge recombination is critical to prepare perovskite solar cells with high efficiency and superior stability. We demonstrate that the incorporation of an effective additive 1,3-diaminoguanidine monohydrochloride (DAGCl) in the MAPbI 3 fil...

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Bibliographic Details
Published in:Materials chemistry frontiers 2019-07, Vol.3 (7), p.1357-1364
Main Authors: Yao, Jiaxu, Wang, Hui, Wang, Pang, Gurney, Robert S, Intaniwet, Akarin, Ruankham, Pipat, Choopun, Supab, Liu, Dan, Wang, Tao
Format: Article
Language:English
Subjects:
Carrier lifetime
Charge transport
Efficiency
Energy conversion efficiency
Grain size
Maximum power
Perovskites
Photovoltaic cells
Service life assessment
Solar cells
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Summary:A photoactive layer with efficient charge transport and low charge recombination is critical to prepare perovskite solar cells with high efficiency and superior stability. We demonstrate that the incorporation of an effective additive 1,3-diaminoguanidine monohydrochloride (DAGCl) in the MAPbI 3 film can increase the perovskite grain size and reduce trap density, consequently increasing the carrier lifetime and reducing charge recombination. This leads to an improvement in maximum power conversion efficiency from 19.1% to 20.3% as well as increased lifetime, with an inverted device structure of glass/ITO/PolyTPD/MAPbI 3 /PC 61 BM/ZrAcac/Ag. Incorporation of an effective additive 1,3-diaminoguanidine monohydrochloride in MAPbI 3 film can increase the grain size and reduce trap density, consequently increasing the carrier lifetime and reducing charge recombination, leading to an improved efficiency from 19.1% to 20.3% in a p-i-n structured solar cell.
ISSN:2052-1537
2052-1537
DOI:10.1039/c9qm00112c