[1] [1] T.S. Shyju, S. Anandhi and R. Suriakarthick, Journal of Solid State Chemistry 227, 165 (2015).

[2] [2] Shin B, Gunawan O and Zhu Y, Progress in Photovoltaics Research & Applications 21, 72 (2013).

[3] [3] Repins, Ingrid and Beall, Solar Energy Materials & Solar Cells 101, 154 (2012).

[4] [4] Wang K, Gunawan O and Todorov T, Appl. Phys. Lett. 97, 143508 (2010).

[5] [5] Swati J. Patil, Vaibhav C. Lokhande and Dong-Weon Lee, Optical Materials 58, 418 (2016).

[6] [6] Weber A, Mainz R and Schock H W, J. Appl. Phys. 107, 013516 (2010).

[7] [7] Redinger A and Siebentritt S, Appl. Phys. Lett. 97, 092111 (2010).

[8] [8] Redinger A, Berg D M, Dale P J and Siebentritt S, J. Am. Chem. Soc. 133, 3320 (2011).

[9] [9] Matsushita H, Maeda T and Katsui A, Journal of Crystal Growth 208, 416 (2000).

[10] [10] Jing Guo, Wen-Hui Zhou and Ying-Li Pei, Solar Energy Materials & Solar Cells 155, 209 (2016).

[11] [11] Salomé PMP, Fernandes PA and da Cunha AF, Thin Solid Films 517, 2531 (2009).

[12] [12] Ahn S, Jung S and Gwak J, Appl. Phys. Lett. 97, 021905 (2010).

[13] [13] Amiri N B M and Postnikov A, Phys Rev B 82, 1616 (2010).

[14] [14] Ennaoui A, Lux-Steiner M and Weber A, Thin Solid Films 517, 2511 (2009).

[15] [15] Morell G, Katiyar R S and Weisz S Z, Appl. Phys. Lett. 69, 987 (1996).

[16] [16] Salomé P M P, Malaquias J and Fernandes P A, Solar Energy Materials & Solar Cells 101, 147 (2012).

[17] [17] Ganchev M, Iljina J and Kaupmees L, Thin Solid Films 519, 7394 (2011).