Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 56, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.56.08MC05
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Funding
- Nanyang Technological University (NTU), Singapore
- Johnson Matthey Centre U.K.
- National Research Foundation (NRF) Singapore through CRP [NRF-CRP-14-2014-03]
- SinBeRISE CREATE programme
- NTU-A*STAR Silicon Technologies Centre of Excellence [11235100003]
- MOE Tier 1 grant [RG184/14]
- Nanyang Technological University [M4080514]
- Ministry of Education [RG101/15, MOE2013-T2-1-081, MOE2014-T2-1-044]
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In this work we have studied the feasibility of highly symmetric guanidinium (GA; CH6N3+) cation in perovskite based solar cells. It is an alternative to the methyl ammonium (MA; CH3NH3+) or formamidinium (FA; CH(NH2)(2+)) ions commonly utilized in the perovskite solar cells, may bring additional advantages due to its triad rotational symmetry and zero dipole moment (mu). We noticed that due to steric factors, GA preferably forms two-dimensional (2D) layer, where GA(2)PbI(4) is favored monoclinic structure (E-g = 2.5 eV) and the obtained device efficiency is eta = 0.45%. This study provides a guideline for designing guanidinium based perovskite absorbers for solar cell devices. In addition, through further compositional engineering with mixed organic cations using GA may enhance the device performance. (C) 2017 The Japan Society of Applied Physics
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