Fabrication of low cost perovskite solar cell under ambient conditions using only spin coating deposition methodMichael Hariadi, Istighfari Dzikri, Retno Wigajatri Purnamaningsih and Nji Raden PoespawatiE3S Web Conf., 67 (2018) 01022DOI: https://doi.org/10.1051/e3sconf/20186701022