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Exceptional Long Electron Lifetime in Methylammonium Lead Iodide Perovskite Solar Cell Made from Aqueous Lead Nitrate Precursor
Author(s) -
Hsieh TsungYu,
Pylnev Mikhail,
Palomares Emilio,
Wei TzuChien
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201909644
Subject(s) - materials science , perovskite (structure) , perovskite solar cell , aqueous solution , iodide , triiodide , solar cell , photoluminescence , analytical chemistry (journal) , optoelectronics , chemical engineering , inorganic chemistry , chemistry , dye sensitized solar cell , organic chemistry , electrode , engineering , electrolyte
Studies on the photoelectronic properties of perovskite solar cells (PSCs) made from non‐PbI 2 precursors are seldom reported. In this study, a series of transient techniques are applied to investigate the charge recombination and trap distribution in an efficient PSC fabricated using a low‐toxicity Pb(NO 3 ) 2 /water protocol. A device with identical conversion efficiency fabricated using a conventional PbI 2 /dimethylformamide protocol is also studied for comparison. Transient photovoltage and time‐resolved photoluminescence analysis reveal that the Pb(NO 3 ) 2 /water‐based device exhibits a long lifetime in both bimolecular and trap‐assisted recombination. However, differential capacitance and differential charging analysis indicate that there are more charges stored in the Pb(NO 3 ) 2 /water‐based perovskite layer, which stretches the energy tail from band edge to midband and should provoke serious trap‐assisted recombination. The exceptional long electron lifetime in the Pb(NO 3 ) 2 /water‐based device is explained by a benign defect inactivation, which originates from water and NO 3 − residues from the aqueous precursor solution and is involved in the formation of perovskite crystal. Consequently, despite the perovskite film made from Pb(NO 3 ) 2 /water protocol possessing high trap density, its photovoltaic device still exhibits a long electron lifetime and superior photovoltaic properties.