TY - JOUR
T1 - Thermal Stability and Performance Enhancement of Perovskite Solar Cells through Oxalic Acid-Induced Perovskite Formation
AU - Adil Afroz, Mohammad
AU - Ghimire, Nabin
AU - Reza, Khan Mamun
AU - Bahrami, Behzad
AU - Bobba, Raja Sekhar
AU - Gurung, Ashim
AU - Chowdhury, Ashraful Haider
AU - Iyer, Parameswar Krishnan
AU - Qiao, Qiquan
N1 - Funding Information:
M.A.A. acknowledges the financial grant from the Department of Science and Technology (DST), New Delhi, India and Indo-U.S. Science and Technology Forum (IUSSTF) through Bhaskara Advanced Solar Energy (BASE) fellowship-2018. This work has been supported by NSF MRI (1428992), NASA EPSCoR (NNX15AM83A), U.S.-Egypt Science and Technology (S&T) Joint Fund, and SDBoR R&D Program and EDA University Center Program (ED18DEN3030025). This work is derived from the Subject Data supported in whole or part by NAS and USAID, and any opinions, findings, conclusions, or recommendations expressed in the paper are those of the authors alone and do not necessarily reflect the views of USAID or NAS. P.K.I. acknowledges the Department of Science and Technology (DST), New Delhi, India through the project DST/TSG/PT/2009/23, Deity, India No. 5(9)/2012-NANO (Vol. II) and Max-Planck-Gesellschaft IGSTC/MPG/PG(PKI)/2011A/48.
PY - 2020/3/23
Y1 - 2020/3/23
N2 - Achieving long-term stability along with high power conversion efficiency (PCE) is the biggest obstacle for the pursuit of organic-inorganic perovskite solar cells (PSCs) toward commercialization. Herein, we demonstrate additive assisted perovskite crystal growth as an effective strategy to improve both power conversion efficiency and thermal stability of methylammonium lead triiodide (MAPbI3) perovskite solar cells. For this, oxalic acid (OA) with two bifacial carboxylic acid groups was employed as an additive into the perovskite precursor solution, which facilitated modulating the crystallization process leading to increase in grain size, reduced grain boundaries and trap states. Subsequently, devices fabricated with the OA additive showed a power conversion efficiency of 17.12%, compared to the control device with 14.06%. Furthermore, enhanced thermal stability was achieved for the OA-modified PSCs compared to that of the pristine device. The device without the OA additive retained 14% of the initial PCE after only 9 h of heat treatment at 100 °C, whereas for the same condition, the OA-modified device retained 90% after 9 h and even 70% after 19 h. These observations suggest that OA-assisted morphological improvement of perovskite can offer an efficient approach to further improve the performance as well as stability of the PSCs.
AB - Achieving long-term stability along with high power conversion efficiency (PCE) is the biggest obstacle for the pursuit of organic-inorganic perovskite solar cells (PSCs) toward commercialization. Herein, we demonstrate additive assisted perovskite crystal growth as an effective strategy to improve both power conversion efficiency and thermal stability of methylammonium lead triiodide (MAPbI3) perovskite solar cells. For this, oxalic acid (OA) with two bifacial carboxylic acid groups was employed as an additive into the perovskite precursor solution, which facilitated modulating the crystallization process leading to increase in grain size, reduced grain boundaries and trap states. Subsequently, devices fabricated with the OA additive showed a power conversion efficiency of 17.12%, compared to the control device with 14.06%. Furthermore, enhanced thermal stability was achieved for the OA-modified PSCs compared to that of the pristine device. The device without the OA additive retained 14% of the initial PCE after only 9 h of heat treatment at 100 °C, whereas for the same condition, the OA-modified device retained 90% after 9 h and even 70% after 19 h. These observations suggest that OA-assisted morphological improvement of perovskite can offer an efficient approach to further improve the performance as well as stability of the PSCs.
KW - additive
KW - efficiency
KW - oxalic acid
KW - perovskite solar cells
KW - stability
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U2 - 10.1021/acsaem.9b02111
DO - 10.1021/acsaem.9b02111
M3 - Article
AN - SCOPUS:85082690581
SN - 2574-0962
VL - 3
SP - 2432
EP - 2439
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 3
ER -