Jordi Martorell

Institute of Photonic Sciences

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Johann Toudert

Instituto de Óptica "Daza de Valdés"

Paola Mantilla‐Perez

Universidad de Oviedo

Pablo Romero‐Gómez

Universidad de Málaga

Quan Liu

Hasselt University

Mariia Kramarenko

Institute of Photonic Sciences

Tengfei Li

Chinese Academy of Sciences

Guillermo Martínez‐Denegri

Lodz University of Technology

Xiaowei Zhan

Peking University

Francisco Bernal‐Texca

Institute of Photonic Sciences

Francesco Pastorelli

Technical University of Denmark

Cooperative Institutions

Institute of Photonic Sciences

Consejo Superior de Investigaciones Científicas

Universitat Politècnica de Catalunya

Institute of Science and Technology

Karlsruhe Institute of Technology

Instituto de Ciencia de Materiales de Sevilla

Institut de Recerca en Energia de Catalunya

Institut Català de Nanociència i Nanotecnologia

Universitat Autònoma de Barcelona

Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona

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Solar Cells: Enhanced Light Harvesting in Semitransparent Organic Solar Cells using an Optical Metal Cavity Configuration (Adv. Energy Mater. 2/2015)

Advanced Energy Materials (2015)

Francesco Pastorelli Pablo Romero‐Gómez Rafael Betancur Alberto Martínez‐Otero Paola Mantilla‐Perez

The combined optical management of an optical cavity and a photonic crystal, reported by Jordi Martorell and co-workers in article number 1400614, enhances the performance of semitransparent organic solar cells to achieve power conversion efficiencies comparable to the ones seen in the corresponding opaque cells. This result makes it possible to create window-integrated photovoltaic solutions without compromising power conversion.

Opacity

Hybrid solar cell

Energy transformation

10.1002/aenm.201570008

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Citations (0)

Light coupling into the Whispering Gallery Modes of a fiber array thin film solar cell for fixed partial Sun tracking

Scientific Reports (2014)

Marina Mariano Francisco J. Rodríguez Pablo Romero‐Gómez Gregory Kozyreff Jordi Martorell

We propose the use of whispering gallery mode coupling in a novel configuration based on implementing a thin film cell on the backside of an array of parallel fibers. We performed numerical calculations using the parameters of a thin film organic cell which demonstrate that light coupling becomes more effective as the angle for the incident light relative to the fiber array normal increases up to an optimal angle close to 55 deg. At this angle the power conversion efficiency of the fiber array solar cell we propose becomes 30% times larger than the one from an equivalent planar cell configuration. We demonstrate that the micro fiber array solar cell we propose may perform an effective partial tracking of the sun movement for over 100 degrees without any mechanical help. In addition, in the event that such fiber array cell would be installed with the adequate orientation on a vertical façade, an optimal photon-to-charge conversion would be reached for sunlight incident at 55 deg with respect to the horizon line, very close to the yearly average position for the sun at Latitude of 40 deg.

Ray

Tracking (education)

10.1038/srep04959

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Citations (30)

All-Nanoparticle SnO₂/TiO₂ Electron-Transporting Layers Processed at Low Temperature for Efficient Thin-Film Perovskite Solar Cells

ACS Applied Energy Materials (2018)

Guillermo Martínez‐Denegri Silvia Colodrero Mariia Kramarenko Jordi Martorell

Solution-processed metal halide perovskite materials have revealed outstanding optoelectronic features that make them uniquely suited for photovoltaic applications. Although a rapid progress has led to performances similar to inorganic thin film technologies, the fabrication method of some of the most widely used electron selective layers, based on either mesoporous architectures or high annealing temperatures, may limit yet a future large-scale production. In that regard, planar perovskite solar cell configurations that can be processed at low temperatures are more desirable. Herein, we demonstrate that a few tens of nanometers thick bilayer, made of two types of inorganic oxide nanoparticles, can perform as a robust and low-temperature-processed electron-selective contact for planar perovskite solar cells. Aside from boosting the average efficiency of planar opaque devices, the proposed method allowed us to preserve the main photovoltaic characteristics when thinner active layers, usually exhibiting a noncontinuous morphology, were integrated for semitransparent cells. By providing excellent electronic and coverage features against the bottom electrode, this novel configuration may hence offer an alternative route to approach future inexpensive printable methodologies for the fabrication of efficient low-temperature perovskite solar cells.

Plasmonic solar cell

Indium tin oxide

10.1021/acsaem.8b01118

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Citations (13)

Wide Bandgap Perovskite Photovoltaic Cells for Stray Light Recycling in a System Emitting Broadband Polarized Light

Advanced Energy Materials (2022)

Guillermo Martínez‐Denegri Catarina G. Ferreira Marco A. Ruiz‐Preciado Paul Faßl Mariia Kramarenko

Abstract Perovskite based photovoltaic (PV) cells are unique in combining low open‐circuit voltage losses with a broad bandgap tunability. This makes them an ideal PV cell to recycle photons back into electrical power in a variety of illumination systems or light emitting devices. Here, advantage of these features is taken and wide bandgap (WBG) perovskite PV cells are incorporated in devices suitable for display illumination and demonstrate a high yield in stray light recycling back into electricity with up to a 37.5% power conversion efficiency. The specific device considered is a modified half‐cylinder photonic plate designed to emit diffused broadband polarized light using a nonabsorbing reflective polarizer based on a random dielectric layer distribution. It is experimentally demonstrated that light recycling using appropriately tuned WBG perovskite PV cells becomes very efficient when implemented in systems where the light is emitted from narrowband sources, even if the emission spans a broad wavelength range.

Polarizer

10.1002/aenm.202201473

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Citations (5)

A Two‐Resonance Tapping Cavity for an Optimal Light Trapping in Thin‐Film Solar Cells

Advanced Energy Materials (2017)

Quan Liu Pablo Romero‐Gómez Paola Mantilla‐Perez Silvia Colodrero Johann Toudert

An optimal photon absorption in thin film photovoltaic technologies can only be reached by effectively trapping the light in the absorber layer provided a considerable portion of the photons is rejected or scattered out of such layer. Here, a new optical cavity is proposed that can be made to have a resonant character at two different nonharmonic frequencies when adjusting the materials or geometry configurations of the partially transmitting cavity layers. Specific configurations are found where a reminiscence of such two fundamental resonances coexists leading to a broadband light trapping. When a PTB7‐Th:PC 71 BM organic cell is integrated within such cavity, a power conversion efficiency of 11.1% is measured. This study also demonstrates that when materials alternative to organics are used in the photoactive cell layer, a similar cavity can be implemented to also obtain the largest light absorption possible. Indeed, when it is applied to perovskite cells, an external quantum efficiency is predicted that closely matches its corresponding internal one for a broad wavelength range.

Quantum Efficiency

Optical cavity

10.1002/aenm.201700356

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Citations (31)

Understanding the Internal Conversion Efficiency of BiVO₄/SnO₂ Photoanodes for Solar Water Splitting: An Experimental and Computational Analysis

ACS Applied Energy Materials (2024)

Laura Geronimo Catarina G. Ferreira Valentina Gacha Dimitrios Raptis Jordi Martorell

This work aims to understand the spin-coating growth process of BiVO4 photoanodes from a photon absorption and conversion perspective. BiVO4 layers with thicknesses ranging from 7 to 48 nm and the role of a thin (<5 nm) SnO2 hole-blocking layer have been studied. The internal absorbed photon-to-current efficiency (APCE) is found to be nonconstant, following a specific dependence of the internal charge separation and extraction on the increasing thickness. This APCE variation with BiVO4 thickness is key for precise computational simulation of light propagation in BiVO4 based on the transfer matrix method. Results are used for accurate incident photon-to-current efficiency (IPCE) prediction and will help in computational modeling of BiVO4 and other metal oxide photoanodes. This establishes a method to obtain the sample's thickness by knowing its IPCE, accounting for the change in the internal APCE conversion. Moreover, an improvement in fill factor and photogenerated voltage is attributed to the intermediate SnO2 hole-blocking layer, which was shown to have a negligible optical effect but to enhance charge separation and extraction for the lower energetic wavelengths. A Mott–Schottky analysis was used to confirm a photovoltage shift of 90 mV of the flat-band potential.

10.1021/acsaem.3c02775

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Citations (7)

Circumventing UV Light Induced Nanomorphology Disorder to Achieve Long Lifetime PTB7‐Th:PCBM Based Solar Cells

Advanced Energy Materials (2017)

Quan Liu Johann Toudert Feng Liu Paola Mantilla‐Perez Miguel Montes Bajo

Abstract Large area flexible electronics rely on organic or hybrid materials prone to degradation limiting the device lifetime. For many years, photo‐oxidation has been thought to be one of the major degradation pathways. However, intense illumination may lead to a burn‐in or a rapid decrease in performance for devices completely isolated from corrosive elements as oxygen or moisture. The experimental studies which are presented in here indicate that a plausible triggering for the burn‐in is a spin flip after a UV photon absorption leading to the accumulation of electrostatic potential energy that initiates a rapid destruction of the nanomorpholgy in the fullerene phase of a polymer cell. To circumvent this and achieve highly stable and efficient devices, a robust nanocrystalline ordering is induced in the PCBM phase prior to UV illumination. In that event, PTB7‐Th:PC 71 BM cells are shown to exhibit T 80 lifetimes larger than 1.6 years under a continuous UV‐filtered 1‐sun illumination, equivalent to 7 years for sunlight harvesting at optimal orientation and 10 years for vertical applications.

Degradation

Nanocrystalline material

Sunlight

10.1002/aenm.201701201

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Citations (71)

2D nanosheet SnS2 solution-processed photoanodes: Unveiling enhanced visible light absorption for solar fuels applications

International Journal of Hydrogen Energy (2024)

Yudania Sánchez Maxim Guc Sara Martı́-Sánchez Maykel Jiménez-Guerra Shadai Lugo Loredo

Nanosheet

Visible spectrum

10.1016/j.ijhydene.2024.06.160

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Citations (1)

Enhanced Light Harvesting in Semitransparent Organic Solar Cells using an Optical Metal Cavity Configuration

Advanced Energy Materials (2014)

Francesco Pastorelli Pablo Romero‐Gómez Rafael Betancur Alberto Martínez‐Otero Paola Mantilla‐Perez

An optical metal cavity configuration is used to trap near infrared light in a semitransparent organic solar cell. The efficiency for such cell, which has a higher than 20% transparency in the visible region, is equal to 90% of the efficiency of the corresponding opaque cell.

Opacity

Visible spectrum

10.1002/aenm.201400614

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Citations (62)

Transparent Solar Cells: Light Harvesting at Oblique Incidence Decoupled from Transmission in Organic Solar Cells Exhibiting 9.8% Efficiency and 50% Visible Light Transparency (Adv. Energy Mater. 17/2020)

Advanced Energy Materials (2020)

Quan Liu Luís G. Gerling Francisco Bernal‐Texca Johann Toudert Tengfei Li

In article number 1904196, Xiaowei Zhan, Jordi Martorell and co-workers design a building-integrated transparent photovoltaic window based on an optically tailored organic solar cell, where enhanced sunlight harvesting at large oblique angles is largely decoupled from visual transmission at normal incidence, setting a new performance standard in the field.

Sunlight

10.1002/aenm.202070078

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Citations (1)