Hấp thụ FASnI3 không đồng nhất với trường điện đã được tăng cường cho pin mặt trời perovskite không chì hiệu suất cao

Nano-Micro Letters - Tập 14 - Trang 1-14 - 2022
Tianhao Wu1,2, Xiao Liu3, Xinhui Luo1, Hiroshi Segawa3, Guoqing Tong2, Yiqiang Zhang4, Luis K. Ono2, Yabing Qi2, Liyuan Han1,3
1State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
2Energy Materials and Surface Sciences Unit (EMSSU), Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa, Japan
3Special Division of Environmental and Energy Science, Komaba Organization for Educational Excellence (KOMEX), College of Arts and Sciences, University of Tokyo, Tokyo, Japan
4School of Materials Science and Engineering, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, People’s Republic of China

Tóm tắt

Các tế bào quang điện perovskite (PSC) không chì dựa trên thiếc đã phát triển nhanh chóng trong những năm gần đây và được coi là công nghệ quang điện thân thiện với môi trường đáng hứa hẹn. Tuy nhiên, một chiến lược để ngăn chặn tái tổ hợp điện tích qua một trường điện tích hợp bên trong tinh thể perovskite thiếc vẫn còn thiếu. Trong nghiên cứu này, một hấp thụ perovskite iodua thiếc formamidinium (FASnI3) với gradient Sn2+ theo phương thẳng đứng đã được chế tạo bằng phương pháp tái kết tinh hỗ trợ Lewis base nhằm tăng cường trường điện tích hợp và giảm thiểu tổn thất tái tổ hợp khối bên trong các perovskite thiếc. Kỹ thuật quang phổ điện tử trở kháng sâu cho thấy mức Fermi bị dịch lên khi tăng cường hàm lượng Sn2+ từ đáy lên đỉnh trong lớp FASnI3 không đồng nhất này, tạo ra một trường điện bổ sung để ngăn chặn sự bẫy của các điện tử và lỗ được kích thích bởi ánh sáng. Do đó, hấp thụ FASnI3 với gradient Sn2+ thể hiện hiệu suất hứa hẹn là 13,82% cho các PSC thiếc đảo ngược với mức điện áp hở mạch tăng 130 mV, và tế bào đã được tối ưu hóa duy trì hiệu suất trên 13% sau khi vận hành liên tục dưới ánh sáng 1-sun trong 1.000 giờ.

Từ khóa

#perovskite thiếc #tế bào quang điện không chì #trường điện tích hợp #tổn thất tái tổ hợp #hiệu suất cao

Tài liệu tham khảo

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