Nafees Ahmad

Dr. Nafees Ahmad

College of Chemstry and Chemical Engineering, Central South University, Changsha, Guangdong, China
orcid

Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 February 2021 in Matter
Verified
Journal Article
Closed access
GWGuangbao Wu
Guangbao Wu
TYTinghuan Yang
Tinghuan Yang
XLXing Li
Xing Li
Nafees AhmadNafees Ahmad
Nafees Ahmad
XZXuning Zhang
Xuning Zhang
YZYuan Zhang
Yuan Zhang

15 January 2023 in Advanced Functional Materials
Verified
Journal Article
Closed access
YLYandi Luo
Yandi Luo
GCGuojie Chen
Guojie Chen
SCShuo Chen
Shuo Chen
Nafees AhmadNafees Ahmad
Nafees Ahmad
Muhammad AzamMuhammad Azam
Muhammad Azam
Guangxing LiangGuangxing Liang
Guangxing Liang

30 June 2023 in Advanced Science
Verified
Journal Article
Open access
Nafees AhmadNafees Ahmad
Nafees Ahmad
YZYunhai Zhao
Yunhai Zhao
FYFan Ye
Fan Ye
JZJun Zhao
Jun Zhao
SCShuo Chen
Shuo Chen
Guangxing LiangGuangxing Liang
Guangxing Liang
Cadmium sulfide (CdS) buffer layer is commonly used in Kesterite Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells. However, the toxicity of Cadmium (Cd) and perilous waste, which is generated during the deposition process (chemical bath deposition), and the narrow bandgap (≈2.4 eV) of CdS restrict its large‐scale future application. Herein, the atomic layer deposition (ALD) method is proposed to deposit zinc–tin‐oxide (ZTO) as a buffer layer in Ag‐doped CZTSSe solar cells. It is found that the ZTO buffer layer improves the band alignment at the Ag‐CZTSSe/ZTO heterojunction interface. The smaller contact potential difference of the ZTO facilitates the extraction of charge carriers and promotes carrier transport. The better p–n junction quality helps to improve the open‐circuit voltage (VOC) and fill factor (FF). Meanwhile, the wider bandgap of ZTO assists to transfer more photons to the CZTSSe absorber, and more photocarriers are generated thus improving short‐circuit current density (Jsc). Ultimately, Ag‐CZTSSe/ZTO device with 10 nm thick ZTO layer and 5:1 (Zn:Sn) ratio, Sn/(Sn + Zn): 0.28 deliver a superior power conversion efficiency (PCE) of 11.8%. As far as it is known that 11.8% is the highest efficiency among Cd‐free kesterite thin film solar cells.

21 December 2021 in EcoMat
Verified
Journal Article
Open access
PDF file
Nafees AhmadNafees Ahmad
Nafees Ahmad
HZHuiqiong Zhou
Huiqiong Zhou
PFPing Fan
Ping Fan
Guangxing LiangGuangxing Liang
Guangxing Liang
Non‐fullerene acceptors are currently a hot research area in the development of organic solar cells (OSCs). At present, the‐state‐of‐the‐art power conversion efficiency (PCE) of non‐fullerene organic solar cells (NF‐OSCs) with single and multiple‐junction has surpassed 18% and 19%, respectively. The cathode interlayer (CIL) plays a significant role in the improvement of PCE and the stability of OSCs. Recently, a large number of CIL materials have been employed in OSCs. This review summarizes the recent progress of CIL materials and systematically describes their impact on the device efficiency and stability in single‐junction NF‐OSCs. Firstly, the functions, key requirements, and distinctive features of CILs when used in NF‐OSCs are summarized. Afterward, some big families of materials including metal oxides, metal salts/complexes, small molecules, polymers, composites/hybrids are presented as CIL for NF‐OSCs. Finally, the scale‐up techniques, conclusion, and future challenges regarding CIL in NF‐OSCs are elucidated. image

27 September 2021 in ACS Applied Materials & Interfaces
Verified
Journal Article
Closed access
PFPing Fan
Ping Fan
GCGuo-Jie Chen
Guo-Jie Chen
SCShuo Chen
Shuo Chen
ZZZhuanghao Zheng
Zhuanghao Zheng
Muhammad AzamMuhammad Azam
Muhammad Azam
Zhi-Gang ChenZhi-Gang Chen
Zhi-Gang Chen

19 March 2025 in Energy & Environmental Science
Verified
Journal Article
Closed access
PDF file
Nafees AhmadNafees Ahmad
Nafees Ahmad
JYJun Yuan
Jun Yuan
YZYINGPING ZOU
YINGPING ZOU
This review summarizes the recent progress, challenges, and future perspective towards stable non-fullerene organic solar cells (NF-OSCs) with detailed discussion of various aspects and effective strategies to improve the stability of NF-OSCs.