Abstract
This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halide (MASn(I1-xBr x )3, MA = CH3NH3) thin films were constructed by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. The band bending degree and local current intensity were affected by the Br/I ratio. Photo-generated carriers were more effectively separated and collected at GBs with increased Br content, and hysteresis was observed in Br-rich Sn-halide perovskite.
| Original language | English |
|---|---|
| Article number | 314005 |
| Journal | Nanotechnology |
| Volume | 30 |
| Issue number | 31 |
| DOIs | |
| State | Published - 8 May 2019 |
Keywords
- band bending
- charge separation and collection
- grain boundary
- grain size
- tin-based perovskite
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In: Nanotechnology, Vol. 30, No. 31, 314005, 08.05.2019.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Enhanced carrier transport over grain boundaries in lead-free CH3NH3Sn(I1-xBr x)3 (0 ≤ x ≤ 1) perovskite solar cells
AU - Nguyen, Bich Phuong
AU - Jung, Hye Ri
AU - Kim, Juran
AU - Jo, William
N1 - Funding Information: Bich Phuong Nguyen Hye Ri Jung Juran Kim William Jo Bich Phuong Nguyen Hye Ri Jung Juran Kim William Jo Department of Physics and New & Renewable Energy Research Center (NREC), Ewha Womans University, Seoul 03760, Republic of Korea Bich Phuong Nguyen, Hye Ri Jung, Juran Kim and William Jo 2019-08-02 2019-05-08 08:09:32 cgi/release: Article released cgi/mmedia: Updated ToC/abstract link cgi/mmedia: Removed ToC/abstract link bin/incoming: New from .zip Ministry of Education and Science https://doi.org/10.13039/501100005992 NRF-2018R1A6A1A03025340 National Research Foundation, funded by the Ministry of Science, Technology, and ICT, Republic of Korea NRF-2018R1A2B2003607 yes This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halide (MASn(I 1− x Br x ) 3 , MA�=�CH 3 NH 3 ) thin films were constructed by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. The band bending degree and local current intensity were affected by the Br/I ratio. Photo-generated carriers were more effectively separated and collected at GBs with increased Br content, and hysteresis was observed in Br-rich Sn-halide perovskite. � 2019 IOP Publishing Ltd [1] Green M A, Hishikawa Y, Dunlop E D, Levi D H, Hohl-Ebinger J, Yoshita M and Ho-Baillie A W Y 2019 Prog. Photovolt., Res. Appl. 27 3–12 10.1002/pip.3102 Green M A, Hishikawa Y, Dunlop E D, Levi D H, Hohl-Ebinger J, Yoshita M and Ho-Baillie A W Y Prog. Photovolt., Res. 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PY - 2019/5/8
Y1 - 2019/5/8
N2 - This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halide (MASn(I1-xBr x )3, MA = CH3NH3) thin films were constructed by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. The band bending degree and local current intensity were affected by the Br/I ratio. Photo-generated carriers were more effectively separated and collected at GBs with increased Br content, and hysteresis was observed in Br-rich Sn-halide perovskite.
AB - This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halide (MASn(I1-xBr x )3, MA = CH3NH3) thin films were constructed by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. The band bending degree and local current intensity were affected by the Br/I ratio. Photo-generated carriers were more effectively separated and collected at GBs with increased Br content, and hysteresis was observed in Br-rich Sn-halide perovskite.
KW - band bending
KW - charge separation and collection
KW - grain boundary
KW - grain size
KW - tin-based perovskite
UR - http://www.scopus.com/inward/record.url?scp=85068626071&partnerID=8YFLogxK
U2 - 10.1088/1361-6528/ab19dd
DO - 10.1088/1361-6528/ab19dd
M3 - Article
C2 - 30991362
AN - SCOPUS:85068626071
SN - 0957-4484
VL - 30
JO - Nanotechnology
JF - Nanotechnology
IS - 31
M1 - 314005
ER -