I would propose for you the paper in the following link:https://www.researchgate.net/publication/261229260_High-efficiency_CMOS_rectifier_for_fully_integrated_mW_wireless_power_tr
there is also a review paper in the link:https://www.researchgate.net/publication/281060694_A_Review_and_Design_of_the_On-Chip_Rectifiers_for_RF_Energy_Harvesting
best wishes
Conference Paper High-efficiency CMOS rectifier for fully integrated mW wirel...
Conference Paper A Review and Design of the On-Chip Rectifiers for RF Energy Harvesting