Bulk Heterojunction Solar Cells

Solvent annealing control of bulk heterojunction organic solar cells with 6 6 efficiency based on a benzodithiophene donor core and dicyano acceptor units.

Bulk heterojunction solar cells.

Silicon solar cells specifically fullerene derivatives act as electron acceptors for donor materials like p3ht poly 3 hexyl thiophene 2 5 diyl creating a. In the past decades a p type conjugated polymer and an n type fullerene derivative have been the most commonly used electron donor and electron acceptor respectively. While this isn t the highest on the market the current champion are the maxeon cells offered by sunpower which reach as high as 22 7 efficiency it is a significant improvement over conventional. The journal of physical chemistry c 2015 119 36 20871 20879.

Two types of swcnt films are investigated. The efficiency of heterojunction panels currently on the market ranges from 19 9 up to 21 7 with the newest hjt panels from rec solar. The bulk heterojunction blend of an electron donor and an electron acceptor material is the key component in a solution processed organic photovoltaic device. Remarkable improvement in durability of bulk heterojunction solar cells remarkable progress has been achieved during the last ten years.

Probed by the in situ grazing incidence x ray diffraction and in situ uv vis absorption measurements the seq blade system exhibits a different tendency from each of the binary films during the film formation process. The nature and order of the blocking layers as well as the nature of the metal electrode. The bulk heterojunction bhj structure composed of the physical blend of donor and acceptor photovoltaic materials has been commonly used in polymer solar cells and demonstrated to be the most effective strategy for obtaining high performance devices due to phase separation of donor and acceptor photovoltaic materials and the subsequent. Polymer solar cells usually consist of an electron or hole blocking layer on top of an indium tin oxide ito conductive glass followed by electron donor and an electron acceptor in the case of bulk heterojunction solar cells a hole or electron blocking layer and metal electrode on top.

In recent decades organic thin film bulk heterojunction solar cells have been intensively investigated because of their advantages such as high power conversion efficiency pce low cost light weight and a convenient fabrication process pces of over 15 have been realized recently in single organic solar cells oscs indicating great potential for future. In this work double bulk heterojunction organic solar cells are fabricated by sequential blade cast in ambient conditions. While the first devices had to be stored in an inert atmosphere and degraded quickly on exposure to sunlight today small organic pv modules on flexible substrates with operational lifetimes of a few years are available. Photovoltaic cells featuring a polymeric blend of organics have shown promise in a field largely dominated by inorganic e g.