Nanoscale control of grain boundary potential barrier, dopant density and filled trap state density for higher efficiency perovskite solar cells

Behzad Bahrami, Sally Mabrouk, Nirmal Adhikari, Hytham Elbohy, Ashim Gurung, Khan M. Reza, Rajesh Pathak, Ashraful H. Chowdhury, Gopalan Saianand, Wenjin Yue, Jiantao Zai, Xuefeng Qian, Mao Liang, Qiquan Qiao