All-Inorganic Perovskite Solar Cells: Energetics, Key Challenges, and Strategies toward Commercialization - Faheem, M. Bilal; Khan, Bilawal; Feng, Chao; Farooq, M. Umar; Raziq, Fazal; Xiao, Yequan; Li, Yanbo (ACS energy letters, 2020)