journal article·2021-10-08

Work Function Adjustment of Nb2CTx Nanoflakes as Hole and Electron Transport Layers in Organic Solar Cells by Controlling Surface Functional Groups

Chengwen Huang, Shengwei Shi, Huangzhong Yu

ACS Energy Letters· Volume 6· Issue 10
Publisher page

Abstract

The Nb2CTx nanoflakes as members of the MXene family have attracted a lot of attention because of their unique optoelectronic properties. In this work, we use alkali and annealing treatments to regulate the surface functional groups in Nb2CTx and then adjust its work function (WF). After KOH treatment, the −F group is replaced by an −OH group, leading to a decrease in WF from 4.62 eV (Nb2CO1.2OH0.6F0.2) to 4.32 eV (Nb2CO1.2OH0.8). After annealing, −OH is transformed into −O, resulting in a WF increase to 5.03 eV (Nb2CO1.36OH0.2). Polymer solar cells (PSCs) based on PM6:BTP-eC9:PC71BM with tuned Nb2CTx as the electron transport layer (ETL) and the hole transport layer (HTL) exhibit the highest power conversion efficiency (PCE) of 17.64% and 17.51%, respectively. These efficiencies are comparable to those gained using conventional charge transport layers. This work provides a good method to tune the WF of Nb2CTx and exhibits the Nb2CTx nanoflakes have a great application prospect in PSCs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics and Optoelectronics, South China University of Technology, 510640 Guangzhou, China

Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, 430205 Wuhan, China

South China Institute of Collaborative Innovation, 523808 Dongguan, China

State Key Lab of Subtropical Building Science, South China University of Technology, 510640 Guangzhou, China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Science and Technology Bureau of Dongguan Government · State Key Laboratory of Subtropical Building Science, South China University of Technology · State Key Lab of Subtropical Building Science

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