RT Journal Article
SR Electronic
T1 Black phosphorus quantum dots in inorganic perovskite thin films for efficient photovoltaic application
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaay5661
DO 10.1126/sciadv.aay5661
VO 6
IS 15
A1 Gong, Xiu
A1 Guan, Li
A1 Li, Qingwei
A1 Li, Yan
A1 Zhang, Tao
A1 Pan, Han
A1 Sun, Qiang
A1 Shen, Yan
A1 Grätzel, Carole
A1 Zakeeruddin, Shaik M.
A1 Grätzel, Michael
A1 Wang, Mingkui
YR 2020
UL http://advances.sciencemag.org/content/6/15/eaay5661.abstract
AB Black phosphorus quantum dots (BPQDs) are proposed as effective seed-like sites to modulate the nucleation and growth of CsPbI2Br perovskite crystalline thin layers, allowing an enhanced crystallization and remarkable morphological improvement. We reveal that the lone-pair electrons of BPQDs can induce strong binding between molecules of the CsPbI2Br precursor solution and phosphorus atoms stemming from the concomitant reduction in coulombic repulsion. The four-phase transition during the annealing process yields an α-phase CsPbI2Br stabilized by BPQDs. The BPQDS/CsPbI2Br core-shell structure concomitantly reinforces a stable CsPbI2Br crystallite and suppresses the oxidation of BPQDs. Consequently, a power conversion efficiency of 15.47% can be achieved for 0.7 wt % BPQDs embedded in CsPbI2Br film-based devices, with an enhanced cell stability, under ambient conditions. Our finding is a decisive step in the exploration of crystallization and phase stability that can lead to the realization of efficient and stable inorganic perovskite solar cells.