Article

Polymer‐Fullerene Bulk‐Heterojunction Solar Cells

Konarka Austria GmbH Altenbergerstrasse 69 4040 Linz, Austria
Advanced Materials (Impact Factor: 17.49). 04/2009; 21(13):1323 - 1338. DOI: 10.1002/adma.200801283

ABSTRACT

Solution-processed bulk-heterojunction solar cells have gained serious attention during the last few years and are becoming established as one of the future photovoltaic technologies for low-cost power production. This article reviews the highlights of the last few years, and summarizes today's state-of-the-art performance. An outlook is given on relevant future materials and technologies that have the potential to guide this young photovoltaic technology towards the magic 10% regime. A cost model supplements the technical discussions, with practical aspects any photovoltaic technology needs to fulfil, and answers to the question as to whether low module costs can compensate lower lifetimes and performances.

Download full-text

Full-text

Available from: Gilles Dennler, Mar 10, 2014
  • Source
    • "Over the past 10 years, considerable work has been done on the performance of organic BHJ solar cells and the power conversion efficiencies (PCEs) of 7e9% can now be obtained for small-area devices [5]. However, for commercial energy applications and competitiveness in the photovoltaic market, not only a higher module PCE (over 10%) but also a considerable reduction of manufacturing costs is required [6] [7]. Compared with the further improvement in PCEs, the fabrication cost of organic BHJ solar cells is getting more and more attention [8e10]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Efficient solar cells based on Ag2S/P3HT and PCBM/P3HT heterojunctions are fabricated, in which the Ag2S nanoparticles are deposited on ITO glass via a newly developed high-speed rotating thermal decomposition method as an electron selective layer and a light absorption material. The ITO/Ag2S(n)/P3HT:PCBM films have a complementary effect in the light absorption due to the narrow band gap of Ag2S. The Ag2S nanoparticles in the upper layer of Ag2S film form a vertical nanotree-structure after many cycles of Ag2S deposition and lead to the formation of Ag2S/P3HT bulk heterojunction, which facilitates exciton dissociation at the P3HT/Ag2S interfaces and made Ag2S nanocrystals electron-transport materials in the active layers. Moreover, the Ag2S make a contribution to the photocurrent as a light absorber. The maximum power conversion efficiency of 3.21% is achieved for the fabricated ITO/Ag2S(50)/P3HT:PCBM/MoO3/Au solar cell with high short-circuit current, which is 1.13 times the best efficiency (2.84%) of the ITO/dense-TiO2/P3HT:PCBM/MoO3/Au cell made by the high-temperature process and is also much higher than that of reported similar hybrid solar cells based on Ag2S/conjugated polymer heterojunction. The improvement of the efficiency may result from the reduced charge recombination and increased light absorption due to the formation of Ag2S
    Full-text · Article · Dec 2015 · Journal of Power Sources
  • Source
    • "Bowl-shaped polyaromatic hydrocarbons (PAHs) have emerged in recent years as promising new materials for important technological applications: batteries, optoelectronic devices, photoactive switches and chemical sensors. These curved polyarenes (often called p-bowls) are excellent electron acceptors, comparable to planar PAHs [1] [2] and fullerenes [3] [4], and could serve as key anode components in rechargeable Li-ion batteries. Corannulene, the smallest non-planar fragment of C 60 fullerene [5] [6], was shown to exhibit high degree of lithium intercalation upon step-wise reduction [7] [8] [9] [10] and corannulene-based anode materials have demonstrated a high reversible lithium capacity, almost twice as high as that of fully lithiated graphite [11] [12]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: First-principles calculations combined with the Boltzmann transport theory are used to investigate the electronic transport properties of four members of the extended family of indenocorannulene molecular crystals. The results for the electrical conductivity suggest that all indenocorannulene derivatives should exhibit transport characteristics significantly improved compared to the parent corannulene. In particular, the transport properties of 1,2,4-triindenocorannulene crystal are found to be comparable for electron doping and likely surpass for hole doping the values achievable in sumanene, assuming the same carrier lifetimes. The findings point to a large sensitivity of the charge-carrier conductivity to the size as well as stacking direction of the carbon-rich π-bowls and indicate that this class of corannulene derivatives can provide new structural motifs that can be further tuned to achieve high-performance materials for organic electronic devices.
    Full-text · Article · Nov 2015 · Carbon
  • Source
    • "In the past decades, polymer solar cells (PSCs) have been of great interest for the development of renewable energy technologies because of the advantages of low cost, light weight and flexibility [1] [2] [3] [4]. Very recently, tandem PSCs have afforded power-conversion efficiencies (PCEs) exceeding 10%, showing a promising potential for commercial applications [5] [6]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A series of fulleropyrrolidine derivatives (FPx, x = 1–8) with alternating N-phenyl or N-methyl group were prepared as acceptors for polymer solar cells (PSCs) with the purpose of investigating the effect of N-substitutions on the photovoltaic properties of fullerene materials. More importantly, the morphology studies by means of atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and space charge limited current (SCLC) measurements revealed that FP1 with N-phenyl group possessed not only appropriate miscibility with P3HT but also high electron mobility, which may account for its optimal photovoltaic properties.
    Full-text · Article · Oct 2015 · Carbon
Show more