MA free Sn-Pb-Gex perovskite solar cells
Gaurav Kapil a, Yasuhiro Fujiwara a, Qing Shen a, Hiroshi Segawa b, Shuzi Hayase a
a i-Powered Energy System Research Center (i-PERC), The University of Electro-Communications
b Research Center for Advanced Science and Technology (RCAST), The University of Tokyo 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
Poster, Gaurav Kapil, 092
Publication date: 24th October 2023

Light and thermal stability are big concerns for perovskite solar cells (PSCs). To solve the problem of thermal stability MA free PSCs are one of the candidates. For light stability, still research is going on worldwide [1]. Different strategies have been incorporated such as surface passivation, and the inclusion of big organic cation at A position of ABX3 perovskite structure [2]. In this work, we focused on the improvement of light and thermal stability of tin-lead (Sn-Pb) by the introduction of germanium (Ge) into the crystal lattice by adding GeI2 into the perovskite precursor solution. It is well known that GeI2 can convert to GeO4, and can be located at the top of the absorber layer [3]. Different devices with solar cell architecture such as FTO/Hole transport layer/ Sn-Pb-Ge /Electron transport layer/ BCP/ Ag were fabricated. The control device showed a power conversion efficiency (PCE) of 18.68% (Forward) and 19.10%(Reverse). The target devices with Gex, where x is the fraction of Ge added into the crystal lattice, exhibited an improved PCE of 20.52%(Forward) and 21.23% (Reverse) as shown in Figure 1. Herein, we further evaluated the thermal and light stability of devices. The experimental results will further be supported by XRD, XPS, SEM, and Impedance spectroscopy analysis.

Authors are thankful to NEDO, Japan.

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