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Radiation Hardness of the Triple-Cation Perovskite

Sketch of a tandem solar cells based on silicon and perovskites . Light is coming from below (credit F.Lang,HZB)

Structure and image of the investigated Perovskite solar cell

Decrease of the normalized short circuit current during irradiation with 68 MeV protons of the perovskite solar cell as compared to the much faster decrease, measured for a reference silicon device.

Change of the optical transmittance of an ITO coated glass substrate due to irradiation with 68 MeV protons for 2 different proton fluence values

Monitoring of the parameter change (under AM1.5G conditions) of a Perovskite solar cell during irradiation with 68 MeV protons. For comparison the – much faster - decrease of the normalized short cir

CHEETAH EERA-PV WEBINAR
Lecture offered on site @ ENEA Portici and interactively on-line to any interested registered participant

Dr. Felix LANG, HZB

27^th November 2018
11:00 –12:00 CET

Organic-inorganic perovskites, such as methylammonium lead iodide (CH₃NH₃PbI₃), are direct semiconductors that have recently proven to be ideal for numerous optoelectronic applications ranging from light emitting diodes and lasers to photodetectors, and solar cells. Lately, compositional engineering of the underlying AMX₃ structure has been used to minimize non-radiative losses and maximize power conversion efficiency. Today’s best performing perovskite solar cells make use of a mixture of cesium (Cs⁺), methylammonium (CH₃NH₃⁺, MA) and formamidinium (HC(NH₂)₂⁺, FA) cations. At the same time compositional engineering can be employed to tune the optical band gap between 1.5 eV and 1.9 eV. Consequently, perovskites are a good choice for multi-junction solar-cells with ultrahigh efficiency. Moreover, perovskite based multi-junction solar cells, would be highly attractive for space applications since they can be lightweight, flexible, and highly efficient. In-situ measurements demonstrate that solar cells made from Cs_0.05MA_0.17FA_z0.83Pb(I_0.83Br_0.17)₃ are radiation hard and possess negligible degradation under high-energy, high-dose proton irradiation. Analyzing the radiation induced current during irradiation with 68 MeV and 20 MeV protons we found that the Triple-Cation Perovskite even exceeds the radiation hardness of SiC. Our optimized Cs_0.05MA_0.17FA_z0.83Pb(I_0.83Br_0.17)₃ based space solar cells reach efficiencies of 19 % under simulated AM0 illumination and maintain 95 % of their initial efficiency even after irradiation with protons at an energy 68 MeV and a total dose of 10¹² p/cm². Interestingly, we observe a significant slower decay of the open circuit voltage and photoluminescence intensity after proton irradiation. This behavior suggests a complex interplay of the radiation induced defect formation and passivation.