DOI: https://doi.org/10.29363/nanoge.hopv.2016.331
Publication date: 28th March 2016
Organometal halide perovskites have emerged as promising absorber materials for solar cells in the last years. With the fast improvement in power conversion efficiency to over 20 % [1], perovskites have high prospects for low-cost, high efficiency solar cell production. ð¶ð»3ð‘ð»3ð‘ƒð‘ð¼3−ð‘¥ð¶ð‘™ð‘¥ layers can be prepared by a one-step solution based process using ð‘ƒð‘ð¶ð‘™2 and ð‘€ð´ð¼ precursors dissolved in DMF.[2] While solution based processes do not need cost intensive vacuum technology and no high-temperature annealing steps, little is known about the exact mechanisms during synthesis. Employing in-situ photoluminescence and reflection spectroscopy we are able to follow the formation of mixed iodine-chlorine perovskite thin-films in real-time. The evolution of optoelectronic properties is analysed for various temperature profiles and annealing conditions. Intermediate states are characterized in detail using ex-situ optical spectroscopy techniques as well as X-ray diffraction and X-ray fluorescence. Correlating structural and electronic properties, we will present a detailed view on the reaction route during synthesis and specifically the influence of annealing conditions on the optoelectronic properties of the final absorber.
[1] NREL, Best Research Cell Efficiency, 04/04/2016
[2] Lee et al., Science 2012, 338 (6107), 643–647.
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