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Nghiên cứu tính ổn định vận hành của tế bào năng lượng mặt trời perovskite không sử dụng lớp vận chuyển lỗ với lithium fluoride trong lớp vận chuyển electron
Tóm tắt
Vấn đề ổn định của tế bào năng lượng mặt trời perovskite (PSC) là một vấn đề thách thức chưa được giải quyết một cách lý tưởng. Trong bối cảnh này, lớp vận chuyển electron (ETL) đóng một vai trò quyết định trong việc điều chỉnh hiệu suất và độ ổn định của PSC. Chúng tôi trình bày việc sử dụng lithium fluoride (LiF) như một phụ gia trong titanium dioxide xốp (mp-TiO2) với các nồng độ thể tích khác nhau (0–7, v%) làm ETL trong các tế bào PSC vi mô. Các đặc tính điện, quang và hình thái của lớp ETL/lớp perovskite được nghiên cứu. Ở đây, chúng tôi báo cáo rằng các tác nhân LiF không chỉ làm tăng độ đồng nhất bề mặt của lớp ETL và lớp perovskite mà còn tăng cường việc truyền electron nhanh chóng với sự giảm tái tổ hợp điện tích. Tổng thể, các phát hiện của chúng tôi cho thấy mẫu mp-TiO2 doped LiF 2.5% có độ dẫn điện tối ưu (1.44 × 10−3 mS.cm−1) và góc tiếp xúc (23.68°). Hơn nữa, kích thước tinh thể trung bình (332 nm) và góc tiếp xúc cao nhất (59.40°) của lớp perovskite đã được đo. Đáng chú ý, tác nhân LiF làm tăng tính ổn định trên giá kệ của các mẫu đã được xử lý. Thiết bị tối ưu cho thấy sự cải thiện 46% về hiệu suất chuyển đổi năng lượng so với các mẫu tham chiếu và duy trì 90% trong 111 ngày thời gian già hóa mà không cần lớp vận chuyển lỗ.
Từ khóa
#tế bào năng lượng mặt trời perovskite #lớp vận chuyển electron #lithium fluoride #hiệu suất chuyển đổi năng lượng #tính ổn địnhTài liệu tham khảo
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