Safer salts for CdTe nanocrystal solution processed solar cells: the dual roles of ligand exchange and grain growth

2015 ◽  
Vol 3 (24) ◽  
pp. 13057-13065 ◽  
Author(s):  
Troy K. Townsend ◽  
William B. Heuer ◽  
Edward E. Foos ◽  
Eric Kowalski ◽  
Woojun Yoon ◽  
...  
Keyword(s):  
Solar Cells ◽  
Grain Growth ◽  
Ligand Exchange ◽  
Dual Role ◽  
Salt Treatment ◽  
Dual Roles ◽  
Solution Processed ◽  
Cdte Nanocrystal

The dual role of salt treatment was revealed by replacing conventional CdCl2 with non-toxic NH4Cl to simultaneously exchange native ligands and promote grain growth in inorganic CdTe nanocrystal solar cells.

High Efficiency Solution Processed Sintered CdTe Nanocrystal Solar Cells: The Role of Interfaces

Nano Letters ◽  
2014 ◽  
Vol 14 (2) ◽  
pp. 670-675 ◽  
Author(s):  
Matthew G. Panthani ◽  
J. Matthew Kurley ◽  
Ryan W. Crisp ◽  
Travis C. Dietz ◽  
Taha Ezzyat ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Solution Processed ◽  
Cdte Nanocrystal

On the role of solution-processed bathocuproine in high-efficiency inverted perovskite solar cells

Solar Energy ◽  
2021 ◽  
Vol 218 ◽  
pp. 142-149
Author(s):  
Shou-En Chiang ◽  
Anjali Chandel ◽  
Diksha Thakur ◽  
Yan-Ta Chen ◽  
Pei-Chen Lin ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Solution Processed

scholarly journals Hole Transfer Layer Engineering for CdTe Nanocrystal Photovoltaics with Improved Efficiency

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1348 ◽  
Author(s):  
Yasi Jiang ◽  
Yiyang Pan ◽  
Wanhua Wu ◽  
Kaiying Luo ◽  
Zhitao Rong ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Annealing Temperature ◽  
Transfer Layer ◽  
Inverted Structure ◽  
Solution Processed ◽  
Hole Transfer ◽  
Carrier Recombination ◽  
Cdte Nanocrystal ◽  
Contact Electrode

Interface engineering has led to significant progress in solution-processed CdTe nanocrystal (NC) solar cells in recent years. High performance solar cells can be fabricated by introducing a hole transfer layer (HTL) between CdTe and a back contact electrode to reduce carrier recombination by forming interfacial dipole effect at the interface. Here, we report the usage of a commercial product 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro) as a hole transfer layer to facilitate the hole collecting for CdTe nanocrystal solar cells. It is found that heat treatment on the hole transfer layer has significant influence on the NC solar cells performance. The Jsc, Voc, and power conversion efficiency (PCE) of NC solar cells are simultaneously increased due to the decreased contact resistance and enhanced built-in electric field. We demonstrate solar cells that achieve a high PCE of 8.34% for solution-processed CdTe NC solar cells with an inverted structure by further optimizing the HTL annealing temperature, which is among the highest value in CdTe NC solar cells with the inverted structure.

scholarly journals Solution-Processed CdTe Thin-Film Solar Cells Using ZnSe Nanocrystal as a Buffer Layer

2018 ◽  
Vol 8 (7) ◽  
pp. 1195 ◽  
Author(s):  
Yanru Chen ◽  
Xianglin Mei ◽  
Xiaolin Liu ◽  
Bin Wu ◽  
Junfeng Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Buffer Layer ◽  
High Efficiency ◽  
Low Cost ◽  
Buffer Layers ◽  
Thin Film Solar Cells ◽  
Solution Processed ◽  
Cdte Nanocrystal ◽  
First Time

The CdTe nanocrystal (NC) is an outstanding, low-cost photovoltaic material for highly efficient solution-processed thin-film solar cells. Currently, most CdTe NC thin-film solar cells are based on CdSe, ZnO, or CdS buffer layers. In this study, a wide bandgap and Cd-free ZnSe NC is introduced for the first time as the buffer layer for all solution-processed CdTe/ZnSe NC hetero-junction thin-film solar cells with a configuration of ITO/ZnO/ZnSe/CdTe/MoOx/Au. The dependence of the thickness of the ZnSe NC film, the annealing temperature and the chemical treatment on the performance of NC solar cells are investigated and discussed in detail. We further develop a ligand-exchanging strategy that involves 1,2-ethanedithiol (EDT) during the fabrication of ZnSe NC film. An improved power conversion efficiency (PCE) of 3.58% is obtained, which is increased by 16.6% when compared to a device without the EDT treatment. We believe that using ZnSe NC as the buffer layer holds the potential for developing high-efficiency, low cost, and stable CdTe NC-based solar cells.

Role of solution-processed V2O5 in P3HT:PCBM based inverted polymer solar cells

2013 ◽  
Vol 170 ◽  
pp. 7-10 ◽  
Author(s):  
Jian Wu ◽  
Yupeng Zhang ◽  
Peng Xu ◽  
Wenbin Guo ◽  
Liang Shen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Solution Processed ◽  
Inverted Polymer Solar Cells

scholarly journals Efficient CdTe Nanocrystal/TiO2 Hetero-Junction Solar Cells with Open Circuit Voltage Breaking 0.8 V by Incorporating A Thin Layer of CdS Nanocrystal

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 614 ◽  
Author(s):  
Xianglin Mei ◽  
Bin Wu ◽  
Xiuzhen Guo ◽  
Xiaolin Liu ◽  
Zhitao Rong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thin Layer ◽  
Large Scale ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Band Alignment ◽  
Ambient Conditions ◽  
Solution Processed ◽  
Processing Technologies ◽  
Cdte Nanocrystal

Nanocrystal solar cells (NCs) allow for large scale solution processing under ambient conditions, permitting a promising approach for low-cost photovoltaic products. Although an up to 10% power conversion efficiency (PCE) has been realized with the development of device fabrication technologies, the open circuit voltage (Voc) of CdTe NC solar cells has stagnated below 0.7 V, which is significantly lower than most CdTe thin film solar cells fabricated by vacuum technology (around 0.8 V~0.9 V). To further improve the NC solar cells’ performance, an enhancement in the Voc towards 0.8–1.0 V is urgently required. Given the unique processing technologies and physical properties in CdTe NC, the design of an optimized band alignment and improved junction quality are important issues to obtain efficient solar cells coupled with high Voc. In this work, an efficient method was developed to improve the performance and Voc of solution-processed CdTe nanocrystal/TiO2 hetero-junction solar cells. A thin layer of solution-processed CdS NC film (~5 nm) as introduced into CdTe NC/TiO2 to construct hetero-junction solar cells with an optimized band alignment and p-n junction quality, which resulted in a low dark current density and reduced carrier recombination. As a result, devices with improved performance (5.16% compared to 2.63% for the control device) and a Voc as high as 0.83 V were obtained; this Voc value is a record for a solution-processed CdTe NC solar cell.

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