Zn-Ag-In-S quantum dot sensitized solar cells with enhanced efficiency by tuning defects
Hua Zhang1, Wenjuan Fang1, Yuanyuan Zhong1
1Shanghai Key Laboratory of Functional Materials Chemistry, Institute of Applied Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Abstract:
Being an important I-III-VI green quantum dot (QD), AgInS2 (AIS) has been used as sensitizers for QD sensitized solar cells (QDSCs) but with low power conversion efficiency (PCE). Herein, we have used oleylamine as surfactant to synthesize AIS and quaternary Zn-Ag-In-S (ZAIS) QDs via a facile and green method. The assembled AIS QDSCs show high PCE of 2.46%. After doping with Zn to form ZAIS QDs, the defect states have been modified, resulting in the enhanced photoluminescence. The assembled ZAIS QDSCs receive the greatly enhanced PCE of 4.50% with dramatically increased current density. Various characterizations verify that the high quality of QDs, large recombination resistance at QD/electrolyte interface, high photon to electron conversion efficiency and longer electron life are contributed by the tuned intrinsic defects which are strongly related with synthesis and composition, finally leading to the high performance of photovoltaic devices.
Related Concept Videos
Quantum Numbers
The Quantum-Mechanical Model of an Atom
Dot Product
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
Problem-Solving: Tuning of a Guitar String
The string's wave speed can be regulated by varying the linear density. Tension is the other property that determines the speed of...
Dot Product: Problem Solving
Identify the problem: Start by reading the problem and...
Lumber Defects
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...


