Publication date: 2nd November 2020
Contribution of mobile ions to current transport in double cation FA1-xCsxPbI3 n-i-p solar cell structures with NiOx hole transport layers HTL and electron transport layers ETL formed by PCBM or C60 was studied by means of our previously developed suite of techniques comprising of admittance spectroscopy AS, normal and reverse DLTS/RDLTS, photoinduced voltage spectroscopy (PIVTS) [1, 2]. These studies show that the amplitudes of mirror-like peaks in DLTS/RDLTS, the hallmark of mobile ions, strongly decrease when switching from PCBM to C60 and further decrease with the addition of Cl to the growth solution. A similar effect is observed in PIVTS spectra monitoring changes in long-time open circuit Voc relaxations with temperature. The activation energies of peaks in DLTS, PIVTS, and low-frequency admittance spectra are similar to each other. The results indicate that switching the ETL type from PCBM to C60 and adding Cl result in alleviating adverse effects of mobile ions, which correlates with observed changes in solar cells' performance and reliability. Possible reasons for the described phenomena will be discussed.
The work of A.S. Shikoh at NUST MISiS was supported in part by Grant No K4-2018-024 under the program to increase the competitiveness of NUST-MISiS among the World Leading Scientific and Educational centers (Program funded by the Russian Ministry of Science and Education).
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