High‐Efficiency Organic Tandem Solar Cells With Effective Transition Metal Chelates Interconnecting Layer
Abstract
Organic tandem solar cells have two sub‐cells vertically connected via a tunnel junction (or interconnecting layer, ICL), which the ICL plays a critical role of determining the performance of the tandem cell. In this manuscript, we report a new design of the ICL consisting of zirconium (IV) acetylacetonate (Zr‐Acac) as the electron transport layer. The Zr‐Acac has a suitable work function to pin the Fermi‐level of the ICL and hence, can effectively behave as the charge recombination function for the tandem device. Comparing to the reference device consisting of ZnO ETL layer, the Zr‐Acac ICL can effectively enhance the efficiency by 20%, from 8.4 to 10.1% power conversion efficiencies. More importantly, the Zr‐Acac ETL layer functions effectively without thermal annealing, which not only simplifies the tandem solar cell processing, but also widens the front sub‐cell material selection.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 21, 2017
- Source ID
- 10.1002/solr.201700139
Entities
People
- Chenhui Zhu
- Gang Li
- Kung‐hwa Wei
- Lei Meng
- Pengyu Sun
- Sang‐hoon Bae
- Sheng‐yung Chang
- Wenchao Huang
- Yang Yang
- Yao‐tsung Hsieh
- Yu‐che Lin
- Yu‐wei Su
Organizations
- Air Force Office of Scientific Research
- Feng Chia University
- Hong Kong Polytechnic University
- Lawrence Berkeley National Laboratory
- Ministry of Science and Technology of the People's Republic of China
- Monash University
- National Chiao Tung University
- National Stroke Foundation
- Office of Naval Research
- University of California, Los Angeles