Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
The presence of defects due to surface imperfections created during fabrication of halide perovskite induce charge losses sites that affect device performance and stability. In this work, functional organic molecule is dissolved with the anti-solvent to passivate interfacial vacancies and improve moisture tolerance. The additive used is phenylethyl ammonium iodide (PEAI) salt and does not induce formation of low-dimensional perovskites species due to its low concentration. Instead, the organic halide species only passivate the surface of the perovskite and grain boundaries, which results in enhanced hydrophobic character of the perovskite films. This facile solution-processed synthesis was completed for perovskite with different compositions, the standard perovskite MAPbI3, and double cation perovskites, such as MA0.9Cs0.1PbI3 and MA0.5FA0.5PbI3. In terms of photovoltaic application, passivation PEAI allows significant enhancement of photovoltaic performance in regular and inverted architectures. In particular, we found the best performance for the regular MA0.9Cs0.1PbI3 perovskite solar cell (PSC) with average power conversion efficiency (PCE) of 12.1 % in bare solar cell boosted to PEAI-treated devices of 15.97 %, and a maximum PCE of 16.84 % was achieved. Then, the surface defects were properly treated and allowed to reduce the recombination processes at the interface. Furthermore, the unencapsulated devices were tested over 1200 h and the PCEs confirmed stable PCEs in ambient for PEAI-treated samples compared to undoped solar cells. Therefore, this study provides a straightforward avenue to fabricate highly efficient PSCs.
References:
Ripolles, T.S., Serafini, P., Redondo-Obispo, C., Climent-Pascual, E., Masi, S., Mora-Seró, I. and Coya, C. (2022), Interface Engineering in Perovskite Solar Cells by Low Concentration of Phenylethyl Ammonium Iodide Solution in the Antisolvent Step. Energy Technol., 10: 2100890.
T.S.R. acknowledges funding from Community of Madrid under the Talent fellowship 2017-T2/IND-5586 and project F660 financed by Community of Madrid and Rey Juan Carlos University. The authors acknowledge financial support by the Spanish Ministry of Science and Innovation under Projects PID2020-115514RB-I00, MAT2015-65356-C3-2-R, and PID2019-107314RBI00. This work was partially supported by AYUDA PUENTE 2020 URJC. Associated Lab LABCADIO belonging to CM net laboratories ref 351 are also acknowledge. C.R.O. acknowledges funding from the Spanish Ministry of Science and Innovation under a FPI pre-doctoral contract (PRE2019-088433).
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