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Highly Efficient Aqueous‐Processed Hybrid Solar Cells: Control Depletion Region and Improve Carrier Extraction
Author(s) -
Chen NanNan,
Jin Gan,
Wang LiJing,
Sun HeNan,
Zeng QingSen,
Yang Bai,
Sun HaiZhu
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803849
Subject(s) - materials science , optoelectronics , polymer solar cell , heterojunction , cadmium telluride photovoltaics , photovoltaic system , hybrid solar cell , energy conversion efficiency , active layer , fabrication , transmittance , electron mobility , absorption (acoustics) , nanotechnology , aqueous solution , layer (electronics) , thin film transistor , electrical engineering , composite material , medicine , alternative medicine , pathology , engineering , chemistry
Environmental friendly aqueous‐processed solar cells have become one of the most promising candidates for the next‐generation photovoltaic devices. Researchers have made lots of progress in designing active materials with novel structures, manipulating the defects in active materials, optimizing device architecture, etc. However, it has long been a challenge to control the width of the depletion region and enhance carrier extraction ability. Fabrication of a thick bulk heterojunction (BHJ) film is an effective strategy to address these issues but difficult to realize. Herein, the thicker BHJ film of ZnO:CdTe is successfully fabricated and incorporated into CdTe‐poly( p ‐phenylenevinylene) hybrid solar cells. As expected, this BHJ film enhances light absorption, extends the width of the depletion region, prolongs carrier lifetime, and promotes carrier extraction ability. Moreover, the electron transport layer of sol–gel ZnO with excellent transmittance and electrical conductivity boosts electron generation, transport, and injection, which further improves the device performance. As a result, the highest short current density ( J sc ) of 19.5 mA cm −2 , power conversion efficiency of 6.51%, and the widest depletion region (177 nm) are obtained in aqueous‐processed hybrid solar cells.