Details

Autor(en) / Beteiligte

• Yao, Zhibo
• Wang, Wenli
• Shen, Heping
• Zhang, Ye
• Luo, Qiang
• Yin, Xuewen
• Dai, Xuezeng
• Li, Jianbao
• Lin, Hong

Titel

CH3NH3PbI3 grain growth and interfacial properties in meso-structured perovskite solar cells fabricated by two-step deposition

Ist Teil von

• Science and technology of advanced materials, 2017-01, Vol.18 (1), p.253-262

Ort / Verlag

Abingdon: Taylor & Francis

Erscheinungsjahr

2017

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Although the two-step deposition (TSD) method is widely adopted for the high performance perovskite solar cells (PSCs), the CH 3 NH 3 PbI 3 perovskite crystal growth mechanism during the TSD process and the photo-generated charge recombination dynamics in the mesoporous-TiO 2 (mp-TiO 2 )/CH 3 NH 3 PbI 3 /hole transporting material (HTM) system remains unexploited. Herein, we modified the concentration of PbI 2 (C (PbI2) ) solution to control the perovskite crystal properties, and observed an abnormal CH 3 NH 3 PbI 3 grain growth phenomenon atop mesoporous TiO 2 film. To illustrate this abnormal grain growth mechanism, we propose that a grain ripening process is taking place during the transformation from PbI 2 to CH 3 NH 3 PbI 3 , and discuss the PbI 2 nuclei morphology, perovskite grain growing stage, as well as Pb:I atomic ratio difference among CH 3 NH 3 PbI 3 grains with different morphology. These C (PbI2) -dependent perovskite morphologies resulted in varied charge carrier transfer properties throughout the mp-TiO 2 /CH 3 NH 3 PbI 3 /HTM hybrid, as illustrated by photoluminescence measurement. Furthermore, the effect of CH 3 NH 3 PbI 3 morphology on light absorption and interfacial properties is investigated and correlated with the photovoltaic performance of PSCs.