Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 53: Hybrid Perovskite and Photovoltaics II (joint session CPP/HL)
HL 53.2: Talk
Wednesday, March 18, 2020, 15:15–15:30, ZEU 260
Shallow Nano-Textures for Light Management in Solution-Processed Perovskite Solar Cells — •Philipp Tockhorn1, Johannes Sutter1, Klaus Jäger1, Amran Al-Ashouri1, Christiane Becker1, and Steve Albrecht1,2 — 1Helmholtz Zentrum Berlin - 12489 Berlin — 2Technische Universität Berlin - 10623 Berlin
Metal halide perovskites have led to highly efficient thin-film solar cells in the past decade. Here, we report enhanced PCEs achieved by light management in spin-coated perovskite single junction solar cells on shallow nano-textures. For this, sinusoidal nano-textures with a period of 750 nm and a texture height of 380 nm are employed. In our p-i-n devices, the nano-textured substrate is coated with a bottom contact comprising ITO and a self-assembling monolayer as well as a spincoated perovskite, while the top contact is realised by evaporation. With this design, we obtain a PCE of 18.9%, which marks an increase of 3% with respect to its planar reference. This efficiency gain is mostly achieved by an increase in short circuit current density (Jsc), achieved through enhanced light scattering by the sinusoidal nano-textures. External quantum efficiency and reflectance measurements on these devices confirm the observed increase in Jsc of about +1 mA/cm2 promoted by the improved light in-coupling. Furthermore, we observe a systematic reduction of 10-20 mV in open-circuit voltage on the nano-textured devices. Therefore, we investigate the influence of the nano-textures on the electronic quality of the perovskite itself and its interfaces to charge selective contacts with absolute photoluminescence measurements as well as electrical simulations.