Hole Transport Materials with Low Glass Transition Temperatures and High Solubility for Application in Solid-State Dye-Sensitized Solar Cells

Leijtens, Tomas; Ding, I‐Kang; Giovenzana, Tommaso; Bloking, Jason T.; McGehee, Michael D.; Sellinger, Alan

doi:10.1021/nn204296b

Cited by 313 publications

(288 citation statements)

References 29 publications

Supporting

Mentioning

264

Contrasting

Order By: Relevance

“…18 The above observations demonstrate that the V OC was drastically improved 31 is much higher than spiro-MeOTAD (2 × 10 -4 cm 2 V − 1 s). [32][33][34] Therefore, the current density also increases. Supplementary Figure S9 depicts the PCE dependence on MAPbBr 3 particle size with different HTMs.…”

Section: Resultsmentioning

confidence: 99%

Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

2015

View full text Add to dashboard Cite

Easy processability and high stability are key features of methylammonium lead bromide (CH 3 NH 3 PbBr 3 )-based perovskite solar cells. The main focus of the present work was to fabricate and evaluate the stability of CH 3 NH 3 PbBr 3 quantum dot (QD)-based perovskite solar cells. We used an ex situ solution process to synthesize CH 3 NH 3 PbBr 3 QDs and then successfully fabricated mesoscopic solid-state perovskite solar cells. We also studied the influence of different CH 3 NH 3 PbBr 3 QD sizes and different holetransporting materials (HTMs), 2,2′,7,7′-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9′-spirobifluorene (spiro-MeOTAD) and poly[bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), on the solar cell performance. The size of the CH 3 NH 3 PbBr 3 QDs was controlled by the solution processing parameters. Our controlled results show that spiro-MeOTAD-and PTAA-based devices exhibited, respectively, an open-circuit voltage (V OC ) of 0.991 and 1.091 V and a current density (J SC ) of 11.68 and 12.05 mA cm − 2 , which resulted in an average power conversion efficiency (PCE) of 7.35 and 9.44% under a standard 100 mW cm − 2 illumination without masking. Our best-performing cell, which contains the FTO/Bl-TiO 2 /mp-TiO 2 +CH 3 NH 3 PbBr 3 (~2-nm QDs)/PTAA/Au configuration shows the following results: open-circuit voltage (V OC ) = 1.110 V, current density (J SC ) = 14.07 mA cm − 2 , fill factor = 0.73 and an 11.40% PCE. Furthermore, the CH 3 NH 3 PbBr 3 -based devices are stable for more than four months.

show abstract

Section: Resultsmentioning

confidence: 99%

Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

2015

View full text Add to dashboard Cite

show abstract

“…The hole-transporting material Spiro-OMeTAD has been shown to crystallize over time, and this process is accelerated at higher temperatures, even though the glass transition temperature (125 °C) is well above the operating conditions. [236,253,254] Several novel hole transporting materials have been introduced in the last years, of which many show an improved stability of the device under operating conditions, generally achieved by either increasing the glass transition temperature or by cross-linking the HTM. [255][256][257][258] We further note that the loss in performance is often related to the use of additives like Li-TFSI, tert-butylpyridine (tBP), and Co-complexes, necessary to oxidize the HTM and achieve high enough conductivities to ensure balanced charge extraction and maximum device performance.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Petrus

Schlipf

Cheng

et al. 2017

Advanced Energy Materials

304

201

View full text Add to dashboard Cite

following statement: These materials can be processed from solution and yet exhibit optoelectronic materials properties described in classic solid-state physics textbooks. This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.The road towards these achievements has been marked by a constant improvement of perovskite deposition techniques fueled by our increasing understanding of the crystallization processes. The choice of deposition technique, either from solution or vapor, and the composition and order in which precursor species are applied has a great influence on the crystallization kinetics. Here, one can distinguish one-step methods where the perovskite is formed from a precursor mixture dissolved in a common solution, and two-step methods where the inorganic compound is deposited first and transformed to the perovskite phase later by addition of the organic constituents. [9][10][11] Furthermore, many parameters during processing can have an effect on the crystallization mechanism and consequently on film morphology, such as the choice of solvents, concentrations and processing additives that are often not incorporated into the final product. [11][12][13] We discuss this aspect in Section 2, where we focus our attention on the most commonly employed solution-based techniques. Additionally, as for any new technology trying to displace an incumbent technology, higher efficiencies, lower costs, reproducibility, stability, and sustainability are paramount. In particular, reproducibility has been a major challenge in perovskite solar cells from the beginning: small variations in morphology, like crystal size, film roughness, and pinholes can have detrimental effects on photovoltaic performance. [14] On the other hand, current-voltage measurements often showed a hysteresis that is rarely seen in other photovoltaic technologies. [15] These topics are highlighted in Sections 3 and 4. Finally, in Section 5 we discuss the framework for market introduction, such as cost reduction by choosing low-cost charge transport layers, or how the lifetime of perovskite absorbers can be extended by the choice of materials composition.Hybrid metal halide perovskites have become one of the hottest topics in optoelectronic materials research in recent years. Not only have they surpassed everyone's expectations and achieved similar performance as tried and true polycrystalline silicon photovoltaic devices, but they are also finding applications in a variety of different fields, including lighting. The main advantages of hybrid metal halide perovskites are simple processability, compatible with large-scale solution processing such as roll-to-roll printing, a...

show abstract

“…All of the HTMs employ methoxy groups which are reported to have a high tendency to stabilize the radical cations and also increase the hole mobility and solubility. [ 15,20,21 ] The materials were characterized by 1 H/ 13 C NMR and high resolution mass spectrometry (HR-MS) (Supporting Information Figure S1-S8). Additionally, Spiro-OMeTAD is employed as a reference HTM in this study.…”

Section: Design and Synthesismentioning

confidence: 99%

Integrated Design of Organic Hole Transport Materials for Efficient Solid‐State Dye‐Sensitized Solar Cells

Bai

Tian

Lin

et al. 2014

Advanced Energy Materials

View full text Add to dashboard Cite

A series of triphenylamine‐based small molecule organic hole transport materials (HTMs) with low crystallinity and high hole mobility are systematically investigated in solid‐state dye‐sensitized solar cells (ssDSCs). By using the organic dye LEG4 as a photosensitizer, devices with X3 and X35 as the HTMs exhibit desirable power conversion efficiencies (PCEs) of 5.8% and 5.5%, respectively. These values are slightly higher than the PCE of 5.4% obtained by using the state‐of‐the‐art HTM Spiro‐OMeTAD. Meanwhile, transient photovoltage decay measurement is used to gain insight into the complex influences of the HTMs on the performance of devices. The results demonstrate that smaller HTMs induce faster electron recombination in the devices and suggest that the size of a HTM plays a crucial role in device performance, which is reported for the first time.

show abstract

Hole Transport Materials with Low Glass Transition Temperatures and High Solubility for Application in Solid-State Dye-Sensitized Solar Cells

Cited by 313 publications

References 29 publications

Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Integrated Design of Organic Hole Transport Materials for Efficient Solid‐State Dye‐Sensitized Solar Cells

Contact Info

Product

Resources

About