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https://nim.nsc.liu.se/projects/7409/ thermostable hole transport materials for n-i-p perovskite solar cells hole transport materials https://www.kth.se/cbh/kalender/organic-hole-transport-materials-for-perovskite-solar-cells-1.1006714?date=2020-09-30&orgdate=2020-04-02&length=1&orglength=274 Organic Hole-Transport Materials for Perovskite Solar Cells | KTH hole transport materials perovskite solar cells organic kth