Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.2: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Charge Carrier Lifetime in methylammonium lead halide perovskite thin films — •Fabian Meier, Cornelius Krasselt und Carsten Deibel — Institute of Physics, Chemnitz University of Technology, 09126 Chemnitz, Germany

Thin film solar cells have shifted into the spotlight of current research and development because of their promising low-cost production resulting from high-throughout fabrication at low processing temperatures(1). Recently, hybrid perovskite structures on the base of lead halides have attracted considerable attention due to a tremendous increase in their power conversion efficiencies from 4 % to nearly 18 % within only a few years (2). Uncovering the recombination processes is of major importance for understanding and potentially circumventing the intrinsic losses in perovskite thin films. We performed absorption and photoluminescence (PL) meassurements of both mixed and pure methylammonium lead halides. The comparably sharp onsets of absorption and emission as well as the small Stokes shift between them are signs for the small energy losses of the charge carriers within corresponding solar cells. The charge carrier decay dynamics were investigated by performing time-resolved PL decay by time correlated single photon counting. We will discuss our results in view of the role of free carrier recombination and trap assisted recombination.

(1)*G.E. Eperon et all, Adv. Funct. Mater. 2014, 24, 151-157 (2)*N.G. Park, Mater. Today (2014), http://dx.doi.org/10.1016/j.mattod.2014.07.007