EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 3BV.1.14 3D/2D Perovskite Solar Cells with Improved Performance and Stability Based on a Novel Ammonium Salt
Type: Visual
Date: Tuesday, 7th September 2021
08:30 - 10:00
Author(s): U. Gunes, E. Bag Celik, C. Ceren Akgul, M. Koç, M. Ameri, B. Eren Uzuner, M. Ghasemi, M. Cem Sahiner, I. Yildiz, H. Kaya, S. Yerci, G. Gunbas
Presenter / Speaker: U. Gunes, METU, Ankara, Turkey
Event: Conference Conference
Session: 3BV.1 Perovskite Solar Cells and Modules
Topic: 3. 1 Perovskites
Summary / Abstract: 3D metal hybrid perovskites have attracted great attention due to their enormous optical and electrical properties. The highest certified PCE has soared to 25.2% in a decade. However, their instability stands asthe major obstacle to their commercialization. Although low dimensional perovskites typically exhibit higher stability, they suffer from lower efficiencies compared to their 3D counterparts. Thus, 3D / 2D perovskite solar cells are proposed to achieve high efficiency and stability simultaneously. In this study, we inserted a low dimensional perovskite layer – having a novel cation – between the FAMAPbIBrCl and the hole transport layer (spiro-OMeTAD). 3D/2D perovskite devices fabricated in this research exhibited improved fill factor, resulting in an increase in their power conversion efficiencies (PCE) from 17% to over 19% (Fig. 1). We demonstrate that this increase is due to better hole extraction in terms of drift-diffusion modeling, which is set up using the measured energy band positions. Thanks to the hydrophobic nature of the large organic cation synthesized by us, the 3D/2D perovskite solar cell maintained 82% of its initial efficiency under 15% humidity for 400 h without encapsulation while the reference devices maintained only 39% of its initial efficiency. We fabricated semitransparent cells reaching 17.9%, among the highest reported efficiencies for the utilized perovskite composition. The semi-transparent 3D/2D perovskite has been maintaining its over 90% efficiency for 4 weeks. 3D/2D perovskite solar cells developed in this work provides higher efficiency, lower hysteresis index (near zero), higher stability compared to their 3D counterparts, paving an avenue for achieving commercially appealing solar cells.