کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1552542 1513204 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling the PbI2 formation in perovskite solar cells using XRD/XPS patterns
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Modeling the PbI2 formation in perovskite solar cells using XRD/XPS patterns
چکیده انگلیسی


• Estimation of defective layer's thickness in perovskite solar cells using XRD/XPS patterns.
• Moisture or prolonged irradiation cause defective layer i.e. PbI2 with nanometer thickness.
• Graphene's network reduces the effect of aging and a thinner defective layer forms.

The impact of prolonged irradiation and air humidity on the stability of perovskite solar cells is modeled using X-ray diffraction and X-ray photoelectron spectroscopy patterns reported in the literature. Light or air-moisture causes the formation of a thin PbI2 or oxide defective layers (in nanoscale) at the interface of perovskite/hole-transport-layer or at the junction with metallic back contact. This thin layer blocks the carrier transport/passivation at the interfaces and cause degradation of device parameters. Variation in thickness of defective layers, changes the XRD and XPS peaks. This allows detection and estimation of the type, crystallinity and thickness of the defective layer. A simple model is developed here to extract the thickness of such thin defective layers formed in nanometer scale at the back region of several perovskite devices. Based on this information, corrected energy band diagram of every device before and after degradation/aging is drawn and discussed in order to obtain insight into the carrier transport and charge collection at the barrier region. In addition, graphene contacted perovskite devices are investigated showing that honey-comb network of graphene contact reduces the effect of aging leading to formation of a thinner defective layer at the perovskite surface compared to perovskite devices with conventional inorganic contacts i.e. Au, Al.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 97, September 2016, Pages 556–561
نویسندگان
, , , ,