Impact of piezoelectric polarization on the performance of InGaN/GaN p–i–n solar cells with Ga- and N-face polarityBilel Chouchen, Ali T. Hajjiah, Matthias Auf der Maur and Mohamed Hichem GazzahEur. Phys. J. Plus, 137 12 (2022) 1296DOI: https://doi.org/10.1140/epjp/s13360-022-03528-3