Promises and challenges of perovskite solar cells

Science, Journal Year: 2017, Volume and Issue: 358(6364), P. 739 - 744

Published: Nov. 9, 2017

The efficiencies of perovskite solar cells have gone from single digits to a certified 22.1% in few years' time. At this stage their development, the key issues concern how achieve further improvements efficiency and long-term stability. We review recent developments quest improve current state art. Because photocurrents are near theoretical maximum, our focus is on efforts increase open-circuit voltage by means improving charge-selective contacts charge carrier lifetimes perovskites via processes such as ion tailoring. challenges associated with cell device stability include role testing protocols, ionic movement affecting performance metrics over extended periods time, determination best ways counteract degradation mechanisms.

Language: Английский

---

Rational molecular passivation for high-performance perovskite light-emitting diodes

Nature Photonics, Journal Year: 2019, Volume and Issue: 13(6), P. 418 - 424

Published: March 25, 2019

Language: Английский

---

Minimizing non-radiative recombination losses in perovskite solar cells

Nature Reviews Materials, Journal Year: 2019, Volume and Issue: 5(1), P. 44 - 60

Published: Nov. 19, 2019

Language: Английский

---

Visualization and suppression of interfacial recombination for high-efficiency large-area pin perovskite solar cells

Nature Energy, Journal Year: 2018, Volume and Issue: 3(10), P. 847 - 854

Published: July 25, 2018

Language: Английский

---

The impact of energy alignment and interfacial recombination on the internal and external open-circuit voltage of perovskite solar cells

Energy & Environmental Science, Journal Year: 2019, Volume and Issue: 12(9), P. 2778 - 2788

Published: Jan. 1, 2019

Charge transport layers (CTLs) are key components of diffusion controlled perovskite solar cells, however, they can induce additional non-radiative recombination pathways which limit the open circuit voltage (V_OC) cell. In order to realize full thermodynamic potential absorber, both electron and hole layer (ETL/HTL) need be as selective possible. By measuring quasi-Fermi level splitting (QFLS) perovskite/CTL heterojunctions, we quantify interfacial current for a wide range commonly used CTLs, including various hole-transporting polymers, spiro-OMeTAD, metal oxides fullerenes. We find that all studied CTLs V_OC by inducing an is significantly larger than loss in neat least-selective interface sets upper device. The results also show equals internal QFLS absorber (pin, nip) cells with power conversion efficiencies up 21.4%. However, case less substantially lower indicates losses at contacts and/or interfaces. findings corroborated rigorous device simulations outline several important considerations maximize V_OC. This work shows real challenge supress on their way radiative lies suppression carrier

Language: Английский

---

Interpretation and evolution of open-circuit voltage, recombination, ideality factor and subgap defect states during reversible light-soaking and irreversible degradation of perovskite solar cells

Energy & Environmental Science, Journal Year: 2017, Volume and Issue: 11(1), P. 151 - 165

Published: Nov. 2, 2017

Insights into the interplay of different recombination mechanisms and their origins (bulk, surface) are provided comparing fresh, light-soaked aged devices.

Language: Английский

---

Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells

Science, Journal Year: 2022, Volume and Issue: 375(6579), P. 434 - 437

Published: Jan. 27, 2022

A stable perovskite heterojunction was constructed for inverted solar cells through surface sulfidation of lead (Pb)-rich films. The formed lead-sulfur (Pb-S) bonds upshifted the Fermi level at interface and induced an extra back-surface field electron extraction. resulting devices exhibited a power conversion efficiency (PCE) >24% with high open-circuit voltage 1.19 volts, corresponding to low loss 0.36 volts. strong Pb-S could stabilize heterojunctions strengthen underlying structures that have similar crystal lattice. Devices retained more than 90% initial PCE after aging 85°C 2200 hours or operating maximum point under continuous illumination 1000 55° ± 5°C.

Language: Английский

---

Defect and Contact Passivation for Perovskite Solar Cells

Advanced Materials, Journal Year: 2019, Volume and Issue: 31(25)

Published: May 7, 2019

Abstract Metal‐halide perovskites are rapidly emerging as an important class of photovoltaic absorbers that may enable high‐performance solar cells at affordable cost. Thanks to the appealing optoelectronic properties these materials, tremendous progress has been reported in last few years terms power conversion efficiencies (PCE) perovskite (PSCs), now with record values excess 24%. Nevertheless, crystalline lattice often includes defects, such interstitials, vacancies, and impurities; grain boundaries surfaces, dangling bonds can also be present, which all contribute nonradiative recombination photo‐carriers. On device level, undesirably inflates open‐circuit voltage deficit, acting thus a significant roadblock toward theoretical efficiency limit 30%. Herein, focus is on origin various voltage‐limiting mechanisms PSCs, possible mitigation strategies discussed. Contact passivation schemes effect methods reduction hysteresis described. Furthermore, several demonstrate how passivating contacts increase stability PSCs elucidated. Finally, remaining key challenges contact design prioritized outlook will further market readiness high‐efficiency presented.

Language: Английский

---

Defects in metal triiodide perovskite materials towards high-performance solar cells: origin, impact, characterization, and engineering

Chemical Society Reviews, Journal Year: 2018, Volume and Issue: 47(12), P. 4581 - 4610

Published: Jan. 1, 2018

The rapid development of solar cells (SCs) based on organic-inorganic hybrid metal triiodide perovskite (MTP) materials holds great promise for next-generation photovoltaic devices. demonstrated power conversion efficiency the SCs MTP (PSCs short) has reached over 20%. An material is a kind soft ionic solid semiconductor. intrinsic optoelectronic properties are greatly determined by several factors, such as crystalline phase, doping type, impurities, elemental composition, and defects in its crystal structure. In PSCs, good understanding smart engineering have been to be key factor fabrication high-efficiency PSCs. this review, we start with brief introduction types mechanisms their formation MTP. Then, positive negative impacts important features presented. mainly include charge recombination, transport, ion migration, structural stability. Moreover, commonly used techniques characterization systematically summarized. Recent progress state-of-the-art defect approaches optimization PSC devices also summarized, provide some perspectives PSCs long-term stability through

Language: Английский

---

Nonradiative Recombination in Perovskite Solar Cells: The Role of Interfaces

Advanced Materials, Journal Year: 2019, Volume and Issue: 31(52)

Published: Oct. 21, 2019

Abstract Perovskite solar cells combine high carrier mobilities with long lifetimes and radiative efficiencies. Despite this, full devices suffer from significant nonradiative recombination losses, limiting their V OC to values well below the Shockley–Queisser limit. Here, recent advances in understanding perovskite picoseconds steady state are presented, an emphasis on interfaces between absorber charge transport layers. Quantification of quasi‐Fermi level splitting films without attached layers allows identify origin recombination, explain operational devices. These measurements prove that state‐of‐the‐art cells, at is more important than processes bulk or grain boundaries. Optical pump‐probe techniques give complementary access interfacial pathways provide quantitative information transfer rates velocities. Promising optimization strategies also highlighted, particular view role energy alignment importance surface passivation. Recent record low losses presented where effectively overcome—paving way thermodynamic efficiency

Language: Английский

---