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Updated: Mar 16, 2026

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Electron Transport Layer-Free Solar Cells Based on Perovskite-Fullerene Blend Films with Enhanced Performance and
Jorge Pascual1,2, Ivet Kosta1, T Tuyen Ngo3
1Materials Division, IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón, 196, Donostia-San Sebastián, 20009, Spain.
Abstract:
The solution processing of pinhole-free methylammonium lead triiodide perovskite-C70 fullerene (MAPbI3 :C70 ) blend films on fluorine-doped tin oxide (FTO)-coated glass substrates is presented. Based on this approach, a simplified and robust protocol for the preparation of efficient electron-transport layer (ETL)-free perovskite solar cells is described. Power conversion efficiency (PCE) of 13.6 % under AM 1.5 G simulated sunlight is demonstrated for these devices. Comparative impedance spectroscopy and photostability analysis of the MAPbI3 :C70 and single MAPbI3 films compared with conventional compact TiO2 ETL-based devices are shown. The beneficial impact of using MAPbI3 :C70 blend films is emphasized.
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