Solution‐processed Cu(In,Ga)(S,Se)2 (CIGS) has a great potential for the production of large‐area photovoltaic devices at low cost. However, CIGS solar cells processed from solution exhibit ...relatively lower performance compared to vacuum‐processed devices because of a lack of proper composition distribution, which is mainly instigated by the limited Se uptake during chalcogenization. In this work, a unique potassium treatment method is utilized to improve the selenium uptake judiciously, enhancing grain sizes and forming a wider bandgap minimum region. Careful engineering of the bandgap grading structure also results in an enlarged space charge region, which is favorable for electron–hole separation and efficient charge carrier collection. Besides, this device processing approach has led to a linearly increasing electron diffusion length and carrier lifetime with increasing the grain size of the CIGS film, which is a critical achievement for enhancing photocurrent yield. Overall, 15% of power conversion efficiency is achieved in solar cells processed from environmentally benign solutions. This approach offers critical insights for precise device design and processing rules for solution‐processed CIGS solar cells.
Linear increase of electron diffusion length per average domain spacing is achieved by tuning chalcopyrite grain growth, assisted by positioning a K‐layer in the bulk Cu(In,Ga)(S,Se)2 (CIGS) stack, and this is a key strategy to achieve highly efficient solution‐processed CIGS solar cells.
COMMITTEE ACTIVITIES Hilinski, Chester C.; Goldstein, William M.; Griffith, William C. ...
The Tax lawyer,
01/1970, Volume:
23, Issue:
2
Journal Article
MIDYEAR MEETING OF COUNCIL AND COMMITTEE CHAIRMEN Young, Andrew B.; Park, Lee I.; Johnson, Mark H. ...
Bulletin (American Bar Association. Section of Taxation),
04/1962, Volume:
15, Issue:
3
Journal Article
