Enhanced inverted perovskite solar cells via indium doped nickel oxide as hole transport layer Martín González-Hernández, Sergio E. Reyes, Eider A. Erazo, Pablo Ortiz, María T. Cortés Solar Energy, 2024 • Indium-doped NiOx layers as HTL in inverted perovskite solar cells. • The champion cell was based on NiOxIn-0.5% with a PCE of 20.06%. • Favorable microstructural changes in perovskite layer induced by NiOxIn. • Enhanced charge transport properties of NiOx induced by doping with In. Nickel oxides have been widely used as hole transport layer (HTL) in inverted perovskite solar cells (IPSCs), although the inherent electric limitations of the pristine NiOx material have driven research on its modifications. In this work, the electrochemical deposition (ECD) of indium-doped NiOx layers (NiOxIn) on indium tin oxide (ITO) substrates was investigated for the first time and their properties as HTL in IPSCs were evaluated. It was found that an In:Ni ratio of 0.5 % in the synthesis solution (NiOxIn0.5 %) produced the champion device with power conversion efficiency (PCE) of 20.06 %, Voc of 1.11 V and FF of 78.19 %, while the undoped NiOx IPSC showed a champion PCE of 17.92 %. The stability of the IPSCs was evaluated by tracking the maximum power point during 3000 s and through monitoring photovoltaic parameters for 46 days. Results indicate high stability for both the doped and undoped electrochemical NiOx based devices. Indium doping of NiOx was found to decrease its charge transfer resistance and induce structural changes in the perovskite (PVK) layer, such as increasing its grain size and crystallinity. These effects lead to improved compatibility of the HTL/PVK interface, resulting in low series resistance, better holes extraction and ultimately improved cell performance.
Reduced TiO2 Nanorods Decorated with Carbon Nanodots for Photoelectrochemical Water Oxidation Jhon Puerres, Sergio Polanía, Andrés F. Pérez-Torres, Eider A. Erazo, María T. Cortés, Pablo Ortiz ACS Applied Nano Materials, 2023 The formation of composite materials with carbon nanodots (CNDs) and electrochemical reduction of metal oxide semiconductors are attractive strategies to increase the performance of photoelectrochemical water oxidation. Here, both strategies were used with TiO2 photoelectrodes to analyze their role separately and when combined. For this purpose, TiO2 nanorods were synthesized on fluorine-doped tin oxide (FTO) substrates by a hydrothermal route; after that, TiO2 was subjected to electrochemical reduction by applying a constant potential, and finally, carbon nanodots were incorporated into the TiO2 surface by immersion of the TiO2 samples in a CND solution. The resulting photoelectrodes were characterized by different microscopy, spectroscopy, and electrochemical techniques. The results indicate that the electrochemical reduction allows to increase the lifetime of the electrons in the semiconductor, decreases the charge-transport resistance in the bulk of TiO2, and improves the water oxidation kinetics. In the case of the incorporation of CNDs on the TiO2 surface, it contributes to enhancing the separation of the electron–hole pairs and leads to a lower charge-transfer resistance from the photoelectrode to the electrolyte. In this way, the photocurrent of TiO2 (at 1.23 V vs RHE) had an increase of 36% with electrochemical reduction, 64% with CND decoration, and 103% with a combination of both strategies. These results are important to understand the role of electrochemical reduction and CND decoration in photoelectrochemical systems.
Electrodeposited PEDOT:PSS-Al2o3 improves the steady-state efficiency of inverted perovskite solar cells Eider A. Erazo, Martín Gómez, Leonardo Rios, Edgar J. Patiño, María T. Cortés, Pablo Ortiz Polymers, 2021 The atomic layer deposition (ALD) of Al2O3 between perovskite and the hole transporting material (HTM) PEDOT:PSS has previously been shown to improve the efficiency of perovskite solar cells. However, the costs associated with this technique make it unaffordable. In this work, the deposition of an organic–inorganic PEDOT:PSS-Cl-Al2O3 bilayer is performed by a simple electrochemical technique with a final annealing step, and the performance of this material as HTM in inverted perovskite solar cells is studied. It was found that this material (PEDOT:PSS-Al2O3) improves the solar cell performance by the same mechanisms as Al2O3 obtained by ALD: formation of an additional energy barrier, perovskite passivation, and increase in the open-circuit voltage (Voc) due to suppressed recombination. As a result, the incorporation of the electrochemical Al2O3 increased the cell efficiency from 12.1% to 14.3%. Remarkably, this material led to higher steady-state power conversion efficiency, improving a recurring problem in solar cells.
Preferred Growth Direction by PbS Nanoplatelets Preserves Perovskite Infrared Light Harvesting for Stable, Reproducible, and Efficient Solar Cells Humberto Emmanuel Sánchez‐Godoy, Eider Ansisar Erazo, Andrés Fabián Gualdrón‐Reyes, Ali Hossain Khan, Said Agouram, Eva Maria Barea, Rubén Arturo Rodriguez, Isaac Zarazúa, Pablo Ortiz, María Teresa Cortés, Vicente Muñoz‐Sanjosé, Iwan Moreels, Sofia Masi, Iván Mora‐Seró Advanced Energy Materials, 2020 Formamidinium‐based perovskite solar cells (PSCs) present the maximum theoretical efficiency of the lead perovskite family. However, formamidinium perovskite exhibits significant degradation in air. The surface chemistry of PbS has been used to improve the formamidinium black phase stability. Here, the use of PbS nanoplatelets with (100) preferential crystal orientation is reported, to potentiate the repercussion on the crystal growth of perovskite grains and to improve the stability of the material and consequently of the solar cells. As a result, a vertical growth of perovskite grains, a stable current density of 23 mA cm−2, and a stable incident photon to current efficiency in the infrared region of the spectrum for 4 months is obtained, one of the best stability achievements for planar PSCs. Moreover, a better reproducibility than the control device, by optimizing the PbS concentration in the perovskite matrix, is achieved. These outcomes validate the synergistic use of PbS nanoplatelets to improve formamidinium long‐term stability and performance reproducibility, and pave the way for using metastable perovskite active phases preserving their light harvesting capability.
Photo-induced black phase stabilization of CsPbI3 QDs films Eider A. Erazo, H.E. Sánchez-Godoy, Andrés F. Gualdrón-Reyes, Sofia Masi, Iván Mora-Seró Nanomaterials, 2020 α-CsPbI3 quantum dots (QDs) show outstanding photoelectrical properties that had been harnessed in the fabrication of perovskite QDs solar cells. Nevertheless, the stabilization of the CsPbI3 perovskite cubic phase remains a challenge due to its own thermodynamic and the presence of surface defects. Herein, we report the optimization of the CsPbI3 QDs solar cells, by monitoring the structure, the morphology and the optoelectronic properties after a precise treatment, consisting of the conventional solvent washing with a time limited ultraviolet (UV) exposure combination, during the layer-by-layer deposition. The UV treatment compensates the defects coming from the essential but deleterious washing treatment. The material is stable for 200 h and the PCE improved by the 25% compared with that of the device without UV treatment. The photo-enhanced ion mobility mechanism is discussed as the main process for the CsPbI3 QDs and solar cell stability.
Acetylsalicylic acid as a crystallization modulator for one-step deposited MAPbI3 in inverted perovskite solar cells EA Erazo, SE Reyes, J Puerres, P Ortiz, MT Cortés Materials Science in Semiconductor Processing 211, 110738 , 2026 2026
Enhanced inverted perovskite solar cells via indium doped nickel oxide as hole transport layer M González-Hernández, SE Reyes, EA Erazo, P Ortiz, MT Cortes Solar Energy 276, 112657 , 2024 2024 Citations: 21
Reduced TiO 2 Nanorods Decorated with Carbon Nanodots for Photoelectrochemical Water Oxidation J Puerres, S Polania, AF Pérez-Torres, EA Erazo, MT Cortés, P Ortiz ACS Applied Nano Materials 6 (15), 14029-14039 , 2023 2023 Citations: 16
Tailoring the PEDOT: PSS hole transport layer by electrodeposition method to improve perovskite solar cells EA Erazo, P Ortiz, MT Cortés Electrochimica Acta 439, 141573 , 2023 2023 Citations: 17
Electrodeposited PEDOT:PSS-Al2O3 Improves the Steady-State Efficiency of Inverted Perovskite Solar Cells EA Erazo, M Gomez, L Rios, EJ Patiño, MT Cortés, P Ortiz Polymers 13 (23), 4162 , 2021 2021 Citations: 14
Desarrollo de películas transportadoras de huecos basadas en poli (3, 4-etilendioxitiofeno)-poli (estireno sulfonato)(PEDOT: PSS), y evaluación de su efecto en celdas solares … EA Erazo Moreno Universidad de los Andes , 2021 2021 Citations: 1
Preferred growth direction by PbS nanoplatelets preserves perovskite infrared light harvesting for stable, reproducible, and efficient solar cells HE Sánchez‐Godoy, EA Erazo, AF Gualdrón‐Reyes, AH Khan, ... Advanced Energy Materials 10 (46), 2002422 , 2020 2020 Citations: 40
Electropolymerized PEDOT for inverted perovskite solar cells with enhanced stability EA Erazo, D Castillo-Bendeck, P Ortiz, MT Cortés LatinXChem , 2020 2020
Photo-Induced Black Phase Stabilization of CsPbI 3 QDs Films EA Erazo, HE Sánchez-Godoy, AF Gualdrón-Reyes, S Masi, I Mora-Seró Nanomaterials 10 (8), 1586 , 2020 2020 Citations: 16
NaCl doped electrochemical PEDOT: PSS layers for inverted perovskite solar cells with enhanced stability EA Erazo, D Castillo-Bendeck, P Ortiz, MT Cortés Synthetic Metals 257, 116178 , 2019 2019 Citations: 17
MOST CITED SCHOLAR PUBLICATIONS
Preferred growth direction by PbS nanoplatelets preserves perovskite infrared light harvesting for stable, reproducible, and efficient solar cells HE Sánchez‐Godoy, EA Erazo, AF Gualdrón‐Reyes, AH Khan, ... Advanced Energy Materials 10 (46), 2002422 , 2020 2020 Citations: 40
Enhanced inverted perovskite solar cells via indium doped nickel oxide as hole transport layer M González-Hernández, SE Reyes, EA Erazo, P Ortiz, MT Cortes Solar Energy 276, 112657 , 2024 2024 Citations: 21
Tailoring the PEDOT: PSS hole transport layer by electrodeposition method to improve perovskite solar cells EA Erazo, P Ortiz, MT Cortés Electrochimica Acta 439, 141573 , 2023 2023 Citations: 17
NaCl doped electrochemical PEDOT: PSS layers for inverted perovskite solar cells with enhanced stability EA Erazo, D Castillo-Bendeck, P Ortiz, MT Cortés Synthetic Metals 257, 116178 , 2019 2019 Citations: 17
Reduced TiO 2 Nanorods Decorated with Carbon Nanodots for Photoelectrochemical Water Oxidation J Puerres, S Polania, AF Pérez-Torres, EA Erazo, MT Cortés, P Ortiz ACS Applied Nano Materials 6 (15), 14029-14039 , 2023 2023 Citations: 16
Photo-Induced Black Phase Stabilization of CsPbI 3 QDs Films EA Erazo, HE Sánchez-Godoy, AF Gualdrón-Reyes, S Masi, I Mora-Seró Nanomaterials 10 (8), 1586 , 2020 2020 Citations: 16
Electrodeposited PEDOT:PSS-Al2O3 Improves the Steady-State Efficiency of Inverted Perovskite Solar Cells EA Erazo, M Gomez, L Rios, EJ Patiño, MT Cortés, P Ortiz Polymers 13 (23), 4162 , 2021 2021 Citations: 14
Desarrollo de películas transportadoras de huecos basadas en poli (3, 4-etilendioxitiofeno)-poli (estireno sulfonato)(PEDOT: PSS), y evaluación de su efecto en celdas solares … EA Erazo Moreno Universidad de los Andes , 2021 2021 Citations: 1
Acetylsalicylic acid as a crystallization modulator for one-step deposited MAPbI3 in inverted perovskite solar cells EA Erazo, SE Reyes, J Puerres, P Ortiz, MT Cortés Materials Science in Semiconductor Processing 211, 110738 , 2026 2026
Electropolymerized PEDOT for inverted perovskite solar cells with enhanced stability EA Erazo, D Castillo-Bendeck, P Ortiz, MT Cortés LatinXChem , 2020 2020
