Device physics of back-contact perovskite solar cells

Yang, Zhenhai; Yang, Weichuang; Yang, Xi; Greer, James C.; Sheng, Jiang; Yan, Baojie; Ye, Jichun

doi:10.1039/c9ee04203b

Cited by 66 publications

(78 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,35,37 Since the interfacial HTL/perovskite quality remains unchanged, we assume that this interface can be ignored. The photoelectrical model explains the role of electron mobility in TiO 2 and trap density (D it ) at the TiO 2 /perovskite interface on the photovoltaic performance 15 . The increased electron mobility in TiO 2 leads to faster extraction of charge carriers which is re ected by the increase of the FF (Supplementary Fig.…”

Section: Impact Of Resistive Losses On V Oc and Ffmentioning

confidence: 99%

“…4,5,6,9 Although high-performance devices based on a planar structure were achieved 1,2,10 , utilization of mesoporous TiO 2 (m-TiO 2 ) skeletons has been demonstrated as an e cient structure in most high-e ciency devices 7,11,12 , because of a large TiO 2 /perovskite contact area for interfacial charge transfer and suppressed charge recombination over planar perovskite solar cells 13,14 . A detailed photoelectrical model 15 was proposed to rationalize and quantify the ll factor (FF) losses of devices (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Ding

Kanda

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Remarkable progress in power conversion efficiency of perovskite solar cells (PSCs) has been achieved over the last decade, reaching 25.5%. However, transferring these accomplishments from individual small-size devices into large-area modules while preserving their commercial competitiveness compared to other thin-film solar cells remains a challenge. A major obstacle is to reduce the resistive losses and the number of intrinsic defects of electron transport layers (mesoporous TiO2, ETL) and to fabricate high-quality large-area perovskite films. Here, we report a facile solvothermal method to synthesize single-crystalline TiO2 rhombus-like nanoparticles with exposed {001} facets. Owing to their low lattice mismatch with the perovskite absorber, high electron mobility and lower density of defects, single-crystalline TiO2 nanoparticle-based small-size devices (0.09 cm2) achieve an efficiency of 24.05% and a fill factor of 84.7%. Importantly, these devices maintain about 90% of their initial performance after continuous operation for 1400 h. Combined with vacuum quenching-assisted techniques, we have fabricated large-area modules and obtained a certified efficiency of 22.72% with an active area of nearly 24 cm2. This represents the highest efficiency modules with the lowest efficiency loss between small-size devices and modules, enabling to reproducibly fabricate stable and efficient PSC modules.

show abstract

Section: Impact Of Resistive Losses On V Oc and Ffmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Ding

Kanda

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…[14] Among these prototypes, QIDE is the most widely adopted architecture for PSCs, with a maximum power conversion efficiency (PCE) of 29.9% predicted by theoretical calculations for this device configuration. [15,16] However, large variations (>10%) in the photocurrent (PC) generation efficiency above the electron-collecting and hole-collecting electrodes in the QIDE-based devices have been observed using PC mapping. [10,11] This variation is indicative of unbalanced charge extraction at the perovskite/electron-transporting layer (ETL) and perovskite/hole-transporting layer (HTL) interfaces.…”

Section: Introductionmentioning

confidence: 99%

Balancing Charge Extraction for Efficient Back‐Contact Perovskite Solar Cells by Using an Embedded Mesoscopic Architecture

Lin

Raga

et al. 2021

Advanced Energy Materials

View full text Add to dashboard Cite

PSCs) are based on an architecture in which the perovskite light-absorbing layer is positioned between several other functional layers. [3][4][5][6] As the performance of these perovskite "sandwich"-type devices approach their limit based on the device architecture, the shading effect associated with intrinsic parasitic light absorption and the low defect tolerance of the layered device architecture (e.g., pinhole-related shunting) become a significant barrier to further performance increases.To overcome the shading effect, an alternative device architecture can be employed in which the anode and cathode are both positioned underneath the perovskite light-absorbing layer. This back-contact concept is conventionally employed in siliconbased solar cells and has been adapted recently to PSCs. [7] With the light-absorbing layer being exposed directly to sunlight, shading effects encountered in the sandwich-type architecture are avoided. In addition to removing this parasitic light absorption, the back-contact architecture has the additional benefit of eliminating the need for costly transparent conductive oxide layers.As the performance of organic-inorganic halide perovskite solar cells approaches their practical limits, the use of back-contact architectures, which eliminate parasitic light absorption, provides an effective route toward higher device efficiencies. However, a poor understanding of the underlying device physics has limited further performance improvements. Here a mesoporous charge-transporting layer is introduced into quasi-interdigitated back-contact perovskite devices and the charge extraction behavior with an increased interfacial contact area is studied. The results show that the incorporation of a thin mesoporous titanium dioxide layer significantly shortens the chargetransfer lifetime and results in more efficient and balanced charge extraction dynamics. A high short-circuit current density of 21.3 mA cm -2 is achieved using a polycrystalline perovskite layer on a mesoscopic quasi-interdigitated back-contact electrode, a record for this type of device architecture.

show abstract

“…[5,6] Indeed, the strong absorption coefficient above the bandgap and sharp (excitonic) band edge, [7,8] the small Stokes shift (SS) between photoluminescence (PL) and absorption, [9,10] and the high PL quantum yield (PLQY) [11,12] are outstanding characteristics of HPs and needed ingredients for leading to important PR effect. In this way, over the last 3-4 years, different experimental and theoretical reports have analyzed the efficiency of PR in HPs and the potential benefits in solar cells [13][14][15] or light-emitting diodes, [15,16] among other devices. 15 In particular, experimental studies carried out in CH 3 NH 3 PbX 3 (X = Cl, Br, I) polycrystalline thin films, [17,18] CH 3 NH 3 PbX 3 single crystals, [10,19,20] CsPbBr 3 nano/microwires [21][22][23] or CsPbBr 3 nanocrystals [9] always show that PL spectra experience an important redshift and an elongation of the decay time after traversing some microns of the HP material.…”

mentioning

confidence: 99%

Recycled Photons Traveling Several Millimeters in Waveguides Based on CsPbBr₃ Perovskite Nanocrystals

Navarro-Arenas

Suárez

Gualdrón‐Reyes

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

Such multiple (re)absorption/(re)emission cycles result in a certain population of "recycled photons" concentrated inside the semiconductor. Consequently, an efficient PR effect provides another degree of freedom to control the photon and carrier densities in a semiconductor [2] and hence a way to tailor-made its optoelectronic properties. [3,4] Demonstrated applications include solar cells, light-emitting diodes, or optical modulators. [2] In this context, PR has been recently claimed in halide perovskites (HP), as an effect that could contribute to a certain extent to the excellent conversion efficiencies and emission rates reported for this family of semiconductors. [5,6] Indeed, the strong absorption coefficient above the bandgap and sharp (excitonic) band edge, [7,8] the small Stokes shift (SS) between photoluminescence (PL) and absorption, [9,10] and the high PL quantum yield (PLQY) [11,12] are outstanding characteristics of HPs and needed ingredients for leading to important PR effect. In this way, over the last 3-4 years, different experimental and theoretical reports have analyzed the efficiency of PR in HPs and the potential benefits in solar cells [13][14][15] or light-emitting diodes, [15,16] among other devices. 15 In particular, experimental studies carried out in CH 3 NH 3 PbX 3 (X = Cl, Br, I) polycrystalline thin films, [17,18] CH 3 NH 3 PbX 3 single crystals, [10,19,20] CsPbBr 3 nano/microwires [21][22][23] or CsPbBr 3 nanocrystals [9] always show that PL spectra experience an important redshift and an elongation of the decay time after traversing some microns of the HP material. Although there has been a controversy about the impact of PR in the total PL spectra, [19,24] or if PR dominates or not over carrier diffusion on the effective decay time, [23,25] recent studies on perovskite single crystals [6] and MAPI polycrystalline thin films [18] confirm that PR is the dominant transport mechanism for propagation lengths longer than the diffusion of carriers. Besides, the theoretical analysis predicts that multiple absorption and emission processes produce a certain "diffusive regime of traveling photons" that increases the effective lifetime of photons outcoupled from the sample (thin film, microwire, single crystal …). [26] Indeed, recent theoretical and experimental works demonstrated an enhancement of the open-circuit voltage in solar cells [14,18,27,28] or radiation efficiency in light-emitting diodes [29] when PR is optimized. The standard optical configuration that has been chosen to demonstrate the PR effect in most works consists of a semiconductor thin film deposited on a specific Reabsorption and reemission of photons, or photon recycling (PR) effect, represents an outstanding mechanism to enhance the carrier and photon densities in semiconductor thin films. This work demonstrates the propagation of recycled photons over several mm by integrating a thin film of CsPbBr 3 nanocrystals into a planar waveguide. An experimental set-up based on a frequency modulation spectroscopy allows to ch...

show abstract

Device physics of back-contact perovskite solar cells

Abstract: A fundamental theory including photoelectric response, ion migration and photon recycling effects for back-contact perovskite solar cells is established.

Cited by 66 publications

References 42 publications

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Balancing Charge Extraction for Efficient Back‐Contact Perovskite Solar Cells by Using an Embedded Mesoscopic Architecture

Recycled Photons Traveling Several Millimeters in Waveguides Based on CsPbBr₃ Perovskite Nanocrystals

Contact Info

Product

Resources

About

Device physics of back-contact perovskite solar cells

Abstract: A fundamental theory including photoelectric response, ion migration and photon recycling effects for back-contact perovskite solar cells is established.

Cited by 66 publications

References 42 publications

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Single-crystalline TiO2 Nanoparticles for Narrowing the Scalability Gap towards Stable and Efficient Perovskite Modules

Balancing Charge Extraction for Efficient Back‐Contact Perovskite Solar Cells by Using an Embedded Mesoscopic Architecture

Recycled Photons Traveling Several Millimeters in Waveguides Based on CsPbBr3 Perovskite Nanocrystals

Contact Info

Product

Resources

About

Recycled Photons Traveling Several Millimeters in Waveguides Based on CsPbBr₃ Perovskite Nanocrystals