High‐Performance Polymer Solar Cells Using an Optically Enhanced Architecture

Martínez-Otero, Alberto; Elias, Xavier; Betancur, Rafael; Martorell, Jordi

doi:10.1002/adom.201200027

Cited by 30 publications

(29 citation statements)

References 24 publications

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“…Replacing Ca/Al with bathocuproine (BCP)/Ag electrode enhanced the PCE of PTB7 solar cells from 7.4% to 8.1% . BCP exhibited almost zero extinction coefficient and could enhance the reflectivity of back Ag electrode.…”

Section: Interfacial Engineering For Ptb7 Solar Cellsmentioning

confidence: 99%

Understanding Low Bandgap Polymer PTB7 and Optimizing Polymer Solar Cells Based on It

2014

Advanced Materials

484

406

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Solution processed single junction polymer solar cells (PSCs) have been developed from less than 1% power conversion efficiency (PCE) to beyond 9% PCE in the last decade. The significant efficiency improvement comes from progress in both rational design of donor polymers and innovation of device architectures. Among all the novel high efficient donor polymers, PTB7 stands out as the most widely used one for solar cell studies. Herein the recent development of PTB7 solar cells is reviewed. Detailed discussion of basic property, structure property relationship, morphology study, interfacial engineering, and inorganic nanomaterials incorporation is provided. Possible future directions for further increasing the performance of PTB7 solar cells are discussed.

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Section: Interfacial Engineering For Ptb7 Solar Cellsmentioning

confidence: 99%

Understanding Low Bandgap Polymer PTB7 and Optimizing Polymer Solar Cells Based on It

2014

Advanced Materials

484

406

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“…For the standard configuration, PEDOT:PSS was used as EBL while thermally evaporated BCP as HBL. Details of the preparation of such cells can be found elsewhere [17]. For the inverted solar cells, a thermally evaporated MoO 3 layer was used as EBL while ZnO was used as HBL.…”

Section: 1-device Fabricationmentioning

confidence: 99%

Enhanced stability in semi-transparent PTB7/PC71BM photovoltaic cells

Romero‐Gómez

Betancur

Martínez-Otero

et al. 2015

Solar Energy Materials and Solar Cells

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UPCommonsPortal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Abstract: We studied the performance over time of opaque and semi-transparent PTB7:PC71BM bulk hetero-junction solar cells. For unsealed inverted configuration cells we observe that when the isolation from the environment is improved, the degradation observed is dominated by one single exponential decay. We demonstrate that a dielectric multilayer stack of approximately 550 nm provides an isolation that increases the lifetime of the cell close to ten times. In that event the fill factor appears to be the PV parameter dominating cell degradation resulting from a decrease in the shunt resistance. An Impedance analysis we performed indicates that a Warburg element, attributed to the presence of slowly moving charges such as heavy ions, must be included in thedescription of the experimental data. The contribution from such element increases as the cell degrades in good agreement with a degradation dominated by the corrosive effects from external agents reaching the active layer of the device. We have revised our manuscript according to the comments and suggestions from both reviewers. Enclosed with the manuscript we provide a detailed response to the reviewers points. Essentially, we do not have any strong disagreement with the reviewers remarks and we used their comments and suggestions to improve the manuscript. In response to the request of an ISOS-L-1 test made by reviewer#3, we provide a supplementary data file which is cited in the revised main text. With the submission we provide a detailed response to the reviewers points and an indication of the changes introduced. Additionally, we provide a copy of the text where all changes introduced are in blue.We would like to use this opportunity to thank you again for all the time and consideration dedicated to our manuscript. In the first paragraph in page 6 of the revised manuscript the following sentenceis included: For V< 0,6 V the Warburg feature is not observed and therefore R w is set to 0. The second paragraph in page 6 has been rewritten as follows: Nyquist plots at four different voltages are shown in figures 6 as examples of impedance measurements for three different times. We observe a good agreement between the experimental data and the theoretical fit. The main feature in the complex plane is a typical depressed semicircle in the medium-high frequency range, a standard behaviour in organic solar cells associated to carrier recombination. The semicircle diameter increases with time, which implies an increase of the parallel resistance R P . This leads to a corresponding rise of the recombination time and therefore to an enhancement of the carrier density. Besides, the semicircle depression is more pronounced with time, leading to a decrease of CPE P parameter, and thus moving away from the ideal capacitor behaviour. At low frequencies, for V = 0.6 and 0.8 V, one may observe a tail associated to a Warburg behaviour that is more pronounced as time evolves. This results in an ...

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“…Non-photoactive layers such as electrode interlayers and/or optical spacers also play a crucial role in the overall efficiency. In this way, initially reported 7.4% [2] efficient PTB7 based devices yielded 8.37% [3] and 8.1% [4], when either a polyfluorene derivative -PFN-or bathocuproine (BCP) was respectively used as cathode interlayer. Last but not least, alternative cell designs can also contribute to further enhance the light to electricity conversion [5,6].…”

Section: Introductionmentioning

confidence: 98%