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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Perovskites - organized by Eva M. Herzig (University of Bayreuth, Bayreuth)

CPP 7.2: Talk

Tuesday, March 23, 2021, 09:20–09:40, CPPa

Solution-Processed Perovskite Solar Cells — Florian Mathies¹, Gopinath Paramasivam¹, Janardan Dagar¹, and •Eva Unger^1,2 — ¹Helmholtz Zentrum Berlin — ²Lund University, Sweden

Metal halide perovskites (MHP) are being intensively researched for solar energy conversion applications and are the best solution-processable solar cell technology to date. For scaling the technology, high throughput and material-efficient printing and coating techniques can be utilised to make larger area devices. We will here present our systematic approach translating successful processing strategies developed for spin-coating to slot-die coating and inkjet printing through in-depth rationalisation of MHP formation gained from in-situ optical monitoring. Depending on the composition of MHP precursors and solvents as well as process conditions and process quenching by e.g. an antisolvent, thin film formation proceeds via crystalline intermediate phases or directly into the perovskite phase. Optimisation of MHP precursors composition and processing conditions enabled us to recently achieve 22% power conversion efficiency in small area devices by spin-coating and 15% on large are mini-modules that are being further optimised in the near future. We are currently working on translating process conditions to obtain high quality perovskite thin films to scalable solution based deposition methods such as slot-die coating and inkjet printing. To date, we have demonstrated slot-die coating and inkjet printed small area devices with power conversion efficiencies > 15%.