Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability
Recently perovskite solar cells have been a popular area of photovoltaic solar cells research due to its cost and ease of fabrication. It has seen the fastest growth in the area of efficiency, from 3.8 % to 21% efficiency (Michael Saliba, 2016) achieved today. Compared to conventional first gener...
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sg-ntu-dr.10356-673092023-03-04T15:43:13Z Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability Teo, Royston Wei Jin Nripan Mathews School of Materials Science and Engineering Energy Research Institute @ NTU (ERI@N) DRNTU::Engineering Recently perovskite solar cells have been a popular area of photovoltaic solar cells research due to its cost and ease of fabrication. It has seen the fastest growth in the area of efficiency, from 3.8 % to 21% efficiency (Michael Saliba, 2016) achieved today. Compared to conventional first generation silicon solar cells, fabrication of the perovskite solar cell is faster and cheaper to reproduce due to the precursors are simple solutions and the techniques such as spin-coating and annealing thin films. However, a limitation of the perovskite solar cells is the stability issues that it faces, mainly due to moisture. This area of stability is not yet developed in research and not much is understood about the degradation pathways and mechanisms. In this report, we tackle the issue of moisture stability by introducing a pseudo-halide (thiocyanate (SCN-)) into the methyl ammonium lead iodide (CH3NH3PbI3 (MALI)) perovskite. Accordingly, we have prepared perovskite films by adding methyl ammonium iodide (MAI) and lead(II) iodide PbI2 and lead thiocyanate Pb(SCN)2 precursors (in various mole ratios) to study the moisture stability of the perovskites. We have also explored possibility of perovskite formation by mixing the MAI and Pb(SCN)2 precursors in various molar ratios namely 1:1, 2:1 and 4:1. The perovskite films were characterized using various characterisation techniques such as UV Vis to determine the light absorption capabilities of the film, XRD to characterize the formation of different phases in the film, and FE-SEM to observe the morphology of the film. We have observed an improved moisture stability for the perovskite films by the addition of SCN- in perovskite (MALI) films as compared to the standard perovskite MALI films. Bachelor of Engineering (Materials Engineering) 2016-05-15T01:34:47Z 2016-05-15T01:34:47Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/67309 en Nanyang Technological University 47 p. application/pdf |
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DRNTU::Engineering Teo, Royston Wei Jin Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
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Recently perovskite solar cells have been a popular area of photovoltaic solar cells research due to
its cost and ease of fabrication. It has seen the fastest growth in the area of efficiency, from 3.8 %
to 21% efficiency (Michael Saliba, 2016) achieved today. Compared to conventional first
generation silicon solar cells, fabrication of the perovskite solar cell is faster and cheaper to
reproduce due to the precursors are simple solutions and the techniques such as spin-coating and
annealing thin films. However, a limitation of the perovskite solar cells is the stability issues that
it faces, mainly due to moisture. This area of stability is not yet developed in research and not
much is understood about the degradation pathways and mechanisms.
In this report, we tackle the issue of moisture stability by introducing a pseudo-halide (thiocyanate
(SCN-)) into the methyl ammonium lead iodide (CH3NH3PbI3 (MALI)) perovskite. Accordingly,
we have prepared perovskite films by adding methyl ammonium iodide (MAI) and lead(II) iodide
PbI2 and lead thiocyanate Pb(SCN)2 precursors (in various mole ratios) to study the moisture
stability of the perovskites. We have also explored possibility of perovskite formation by mixing
the MAI and Pb(SCN)2 precursors in various molar ratios namely 1:1, 2:1 and 4:1. The perovskite
films were characterized using various characterisation techniques such as UV Vis to determine
the light absorption capabilities of the film, XRD to characterize the formation of different phases
in the film, and FE-SEM to observe the morphology of the film. We have observed an improved
moisture stability for the perovskite films by the addition of SCN- in perovskite (MALI) films as
compared to the standard perovskite MALI films. |
author2 |
Nripan Mathews |
author_facet |
Nripan Mathews Teo, Royston Wei Jin |
format |
Final Year Project |
author |
Teo, Royston Wei Jin |
author_sort |
Teo, Royston Wei Jin |
title |
Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
title_short |
Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
title_full |
Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
title_fullStr |
Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
title_full_unstemmed |
Introduction of pseudo-halide (SCN−) in CH3NH3PbI3 perovskite films : effect on moisture stability |
title_sort |
introduction of pseudo-halide (scn−) in ch3nh3pbi3 perovskite films : effect on moisture stability |
publishDate |
2016 |
url |
http://hdl.handle.net/10356/67309 |
_version_ |
1759856359337099264 |