Bulk Heterojunction Organic Solar Cells

Five core technologies for their commercialization hongkyu kang school of materials science and engineering research institute for solar and sustainable energies gist icl international collaboration r d centre heeger center for advanced materials gwangju institute of science and technology.

Bulk heterojunction organic solar cells. 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 performance of organic solar cells oscs depends on a fine carefully optimized bulk heterojunction bhj microstructure. Past studies on a tandem strategy of integrating perovskite and bulk heterojunction bhj increased the fabrication complexity. In this work double bulk heterojunction organic solar cells are fabricated by sequential blade cast in ambient conditions.

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. Remarkable improvement in durability of bulk heterojunction solar cells remarkable progress has been achieved during the last ten years. Silicon solar cells specifically fullerene derivatives act as electron acceptors for donor materials like p3ht poly 3 hexyl thiophene 2 5 diyl creating a. Unsatisfactory light harvesting over the wavelength of 500 nm is a critical factor limiting the further improvement in efficiency of halide lead based perovskite solar cells pscs.

Polymer fullerene bulk heterojunction solar cells are a type of solar cell researched in academic laboratories. In the last few years the performance of organic solar cells oscs based on bulk heterojunction bhj structure has remarkably improved. The nature and order of the blocking layers as well as the nature of the metal electrode. The bulk heterojunction blend of an electron donor and an electron acceptor material is the key component in a solution processed organic photovoltaic device.

In this article recent advances in understanding and controlling the bhj mor. Photovoltaic cells featuring a polymeric blend of organics have shown promise in a field largely dominated by inorganic e g. While most advances of the device performance come from the design. 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.

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.