TY - JOUR
T1 - Effect of excessive Pb content in the precursor solutions on the properties of the lead acetate derived CH3NH3PbI3 perovskite solar cells
AU - Chen, Yuanqing
AU - Yerramilli, Aditya
AU - Shen, Yuxia
AU - Zhao, Zhao
AU - Alford, Terry
N1 - Funding Information:
This work is partially supported by the Pan African Materials Institute (PAMI) through funding from the World Bank (PAMI Grant ID ASU-NOA ) to whom the authors are greatly indebted.
Publisher Copyright:
© 2017
PY - 2018/1
Y1 - 2018/1
N2 - Organic–inorganic CH3NH3PbI3 (MAPbI3) inverted structured perovskite films were prepared using Pb(CH3COO)2 (Pb(OAc)2) and CH3NH3I (MAI) as source materials. The structural, optical and photoelectronic properties of the MAPbI3 films varied with the Pb(OAc)2/MAI molar ratio. It was found that the Pb(OAc)2/MAI molar ratio greatly influenced the structure and morphology of the MAPbI3 films. A suitable amount of excessive Pb(OAc)2 (about 5 mol% excessive Pb) in the solution made the film smoother with improved film crystallinity. This resulted in enhanced power conversion efficiency (PCE). However, for films derived from solution with low Pb(OAc)2/MAI or high Pb(OAc)2/MAI ratio, defects such as pits or pinholes were easily formed with low crystallinity, and hence decreased the lifetime of the carriers and photoelectrical properties of the final solar cells. Using a solution with 5% excessive Pb, inverted structured CH3NH3PbI3 perovskite solar cells with PCE of nearly 14% were obtained.
AB - Organic–inorganic CH3NH3PbI3 (MAPbI3) inverted structured perovskite films were prepared using Pb(CH3COO)2 (Pb(OAc)2) and CH3NH3I (MAI) as source materials. The structural, optical and photoelectronic properties of the MAPbI3 films varied with the Pb(OAc)2/MAI molar ratio. It was found that the Pb(OAc)2/MAI molar ratio greatly influenced the structure and morphology of the MAPbI3 films. A suitable amount of excessive Pb(OAc)2 (about 5 mol% excessive Pb) in the solution made the film smoother with improved film crystallinity. This resulted in enhanced power conversion efficiency (PCE). However, for films derived from solution with low Pb(OAc)2/MAI or high Pb(OAc)2/MAI ratio, defects such as pits or pinholes were easily formed with low crystallinity, and hence decreased the lifetime of the carriers and photoelectrical properties of the final solar cells. Using a solution with 5% excessive Pb, inverted structured CH3NH3PbI3 perovskite solar cells with PCE of nearly 14% were obtained.
KW - Lead acetates
KW - Perovskite solar cells
KW - Power conversion efficiency
KW - Precursor solution
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U2 - 10.1016/j.solmat.2017.09.039
DO - 10.1016/j.solmat.2017.09.039
M3 - Article
AN - SCOPUS:85030863294
SN - 0927-0248
VL - 174
SP - 478
EP - 484
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
ER -