Lead-free co-evaporated perovskites for solar cell application
Martin Kroll a, Tim Schramm a, Ran Ji a, Zongbao Zhang a, Changsoon Cho a, Frederik Nehm a, Karl Leo a
a Institute of Applied Physics, TU Dresden, Nöthnitzer Straße, 61, Dresden, Germany
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Poster, Martin Kroll, 040
Publication date: 25th November 2019

Lead-based perovskite solar cells have reached high efficiencies of over 25%[FN1] . However, toxicity and stability of the absorber material are still an obstacle for application and commercialization. Recently the work towards new lead-free absorber materials has drawn more attention in the field of perovskites. These new, fully inorganic, perovskites can be prepared by vacuum deposition.

The novel absorber material systems like bismuth-based double perovskites or other lead-free materials are produced by triple-source co-evaporation of the precursor materials. This results in a high control over the film thickness and its formation. We were able to produce Cs2AgBiBr6 films with increased crystallinity and high phase purity and characterized them with XRD, SEM and AFM. The lead-free double perovskite is now ready to be applied in fully vacuum deposited solar cells. Furthermore, other material combinations are investigated, where we study the influence of halide exchange on the performance of the device and its stability. We also test novel other non-bismuth based double perovskites

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